Consulta: subjectFacets:"Fisheries management"
Registros recuperados: 108
Data/hora: 16/06/2024 23:13:32

Models and indicators for assessing conservation and fisheries-related effects of marine protected areas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pelletier, Dominique; Claudet, Joachim; Ferraris, J; Benedetti Cecchi, L; Garcia Charton, J.
Two kinds of approaches have been used for assessing conservation and fisheries-related effects of marine protected areas (MPAs): (i) statistical modelling based on field data and (ii) mathematical modelling quantifying the consequences of MPAs on the dynamics of populations, communities, and fisheries. Statistical models provide a diagnostic on the impact of MPAs on the ecosystem and resources; they are also needed for devising and assessing sampling designs for monitoring programs. Dynamic models enable exploration of the consequences of MPA designs and other management policies. We briefly review how each of these approaches has been implemented up to now in the literature and identify potential indicators of MPA effects that can be obtained from each...
Tipo: Text
Palavras-chave: Ecosystem conservation; Fisheries management; Modelling; Indicators; Marine Protected Areas.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4229.pdf

An evaluation of changes in stock productivity and consequences for management. An example based on North Atlantic albacore Thunnus alalunga
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Kell, Laurence T; Fromentin, Jean-marc.
Reference points are important elements of fisheries management and the supporting scientific advisory frameworks. However, fish stocks can fluctuate extensively over a large range of spatial and temporal scales independent of human exploitation and there has been a classical tendency to assume a dichotomy, i.e., that changes in fish populations are primarily attributable either to exploitation or to environmental variability. Therefore we look at variability in surplus production and examine the relative impacts of the environment and exploitation on the productivity of North Atlantic albacore (Thunnus alalunga). The analysis revealed that variations were driven by environmental effects. It was also found that substantial variations in time-series of...
Tipo: Text
Palavras-chave: Thunnus alalunga; Albacore; Fisheries management; FLR; Reference points; Stationary processes; Surplus production.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00192/30282/28758.pdf

Effects of biological, economic and management factors on tuna and billfish stock status
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pons, Maite; Branch, Trevor A.; Melnychuk, Michael C.; Jensen, Olaf P.; Brodziak, Jon; Fromentin, Jean-marc; Harley, Shelton J.; Haynie, Alan C.; Kell, Laurie T.; Maunder, Mark N.; Parma, Ana M.; Restrepo, Victor R.; Sharma, Rishi; Ahrens, Robert; Hilborn, Ray.
Commercial tunas and billfishes (swordfish, marlins and sailfish) provide considerable catches and income in both developed and developing countries. These stocks vary in status from lightly exploited to rebuilding to severely depleted. Previous studies suggested that this variability could result from differences in life-history characteristics and economic incentives, but differences in exploitation histories and management measures also have a strong effect on current stock status. Although the status (biomass and fishing mortality rate) of major tuna and billfish stocks is well documented, the effect of these diverse factors on current stock status and the effect of management measures in rebuilding stocks have not been analysed at the global level....
Tipo: Text
Palavras-chave: Fisheries management; Marine conservation; Stock assessment; Stock status; Tuna fisheries.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00333/44383/44107.pdf

An adaptable toolkit to assess commercial fishery costs and benefits related to marine protected area network design
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Daigle, Rémi M.; Monaco, Cristian; Elgin, Ashley K.
Around the world, governments are establishing Marine Protected Area (MPA) networks to meet their commitments to the United Nations Convention on Biological Diversity. MPAs are often used in an effort to conserve biodiversity and manage fisheries stocks. However, their efficacy and effect on fisheries yields remain unclear. We conducted a case-study on the economic impact of different MPA network design strategies on the Atlantic cod (Gadus morhua) fisheries in Canada. The open-source R package that we developed to analyze this case study can be customized to conduct similar analyses for other systems. We used a spatially-explicit individual-based model of population growth and dispersal coupled with a fisheries management and harvesting component. We...
Tipo: Text
Palavras-chave: Cost-benefit analysis; Atlantic Cod; Individual based models; Conservation; Fisheries management.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00690/80169/83235.pdf

Marine biodiversity and ecosystems' services : an updated research agenda as a follow up of the 2010 targets...
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Goulletquer, Philippe.
The Millenium Ecosystem Assessment (2005) demonstrated that the biodiversity is the keystone for the sustainaibility of present and future ecosystems services. In spite of the highly significant effort carried out by the Census of Marine Life over the last ten years, and an increasing research effort, marine biodiversity and precise ecosystem functioning remain largely unknown and failure to reach the CBD 2010 objectives is obvious. Meanwhile, the concept of ‘ecosystem approach’ is progressing, translated into new policies such as the revised European Common Fisheries Policy (CFP). We might question if the scientific community is ready enough to built scenarios for the future and provide integrated advice to the policy makers for biodiversity conservation...
Tipo: Text
Palavras-chave: Marine biodiversity; Ecosystems; Biodiversity governance; Fisheries management.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00015/12598/9475.pdf

Trophic interactions in the coastal ecosystem of Sri Lanka: An ECOPATH preliminary approach
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Haputhantri, S; Villanueva, Ching-maria; Moreau, J.
This study attempts to assemble and summarize existing information in order to build a general representation of the trophic interactions within the shallow coastal ecosystem of Sri Lanka. A multispecific ecosystem-based approach on trophic relationships and their possible variations was performed using ECOPATH. Thirty-nine functional groups were considered representing all trophic levels in the food web.   Time-dynamic simulation was carried out using the ECOSIM routine to evaluate the impact of the 1998 El Nino event on key functional groups. Results show that the time needed for any impacted functional group to recover to its initial abundance increased with the trophic level. Two time-series data sets derived from commercial catch and effort statistics...
Tipo: Text
Palavras-chave: Sri Lanka; Indian Ocean; Fisheries management; Feeding relationships; Trophic level; ECOSIM; ECOPATH; Trophic modelling.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3892.pdf

Size-selective fishing gear and life history evolution in the Northeast Arctic cod
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Jorgensen, Christian; Ernande, Bruno; Fiksen, Oyvind.
Industrial fishing has been identified as a cause for life history changes in many harvested stocks, mainly because of the intense fishing mortality and its size-selectivity. Because these changes are potentially evolutionary, we investigate evolutionarily stable life-histories and yield in an energy-allocation state-dependent model for Northeast Arctic cod Gadus morhua. We focus on the evolutionary effects of size-selective fishing because regulation of gear selectivity may be an efficient management tool. Trawling, which harvests fish above a certain size, leads to early maturation except when fishing is low and confined to mature fish. Gillnets, where small and large fish escape, lead to late maturation for low to moderate harvest rates, but when...
Tipo: Text
Palavras-chave: Life history evolution; Fishing induced changes; Fisheries management; Evolutionary modeling; Energy allocation.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6867.pdf

Analyse des stratégies de contrôle dans une pêcherie gérée par l’effort de pêche : le cas de la pêcherie de coquilles Saint-Jacques de la baie de Saint-Brieuc
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Gallic, Bertrand; Fifas, Spyros; Lesueur, Marie; Roncin, Nicolas; Ropars-collet, Carole.
Since a report by the European Court of Auditor in December 2007, EU officials have been suggesting that the failure of the Common Fisheries Policy (CFP) results from too much non compliance and a weak and inefficient enforcement system. As a result, a stakeholder consultation was organised EU-wide, and a new control regulation has been presented by the European Commission in autumn 2008. The objective of the paper is to discuss the reality and the scope of this assertion in the situation of a French coastal fishery managed through effort control (the Saint-Brieuc scallop fishery). Key outlines of the French control strategy are presented for the first time, based on an extensive work with the key stakeholders (national and regional administrations and...
Tipo: Text
Palavras-chave: Contrôle; Fraude; Pêcheries; Économie; Aménagement; Control policy; Fraud behavior; Economics; Fisheries management.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00480/59148/61776.pdf

Global patterns and inferences of tuna movements and trophodynamics
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Logan, J.m.; Pethybridge, Heidi; Lorrain, Anne; Somes, C.; Allain, Valerie; Bodin, Nathalie; Choy, C.a.; Duffy, L.; Goñi, N.; Graham, B.; Langlais, C.; Ménard, F.; Olson, R.; Young, J.
A global dataset of carbon stable isotope (δ13C) values from yellowfin, bigeye, and albacore tuna muscle tissue (n = 4275) was used to develop a novel tool to infer broad-scale movement and residency patterns of these highly mobile marine predators. This tool was coupled with environmental models and lipid content (C:N ratio) of tuna muscle tissues to examine ocean warming impacts on tuna ecology and bioenergetic condition across Longhurst provinces. Over a 16-year study period (2000–2015), latitudinal gradients in tuna δ13C values were consistent, with values decreasing with increasing latitude. Tuna δ13C values, reflecting modelled global phytoplankton δ13C landscapes (“isoscapes”), were largely related to spatial changes in oxygen concentrations at...
Tipo: Text
Palavras-chave: Albacore tuna; Bigeye tuna; Yellowfin tuna; Carbon isotope analysis; Movement indicators; Global ocean; Fisheries management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00617/72943/71964.pdf

A comparative review of fisheries management experiences in the European Union and in other countries worldwide: Iceland, Australia, and New Zealand
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Marchal, Paul; Andersen, Jesper Levring; Aranda, Martin; Fitzpatrick, Mike; Goti, Leyre; Guyader, Olivier; Haraldsson, Gunnar; Hatcher, Aaron; Hegland, Troels Jacob; Le Floc H, Pascal; Macher, Claire; Malvarosa, Loretta; Maravelias, Christos D.; Mardle, Simon; Murillas, Arantza; Nielsen, J. Rasmus; Sabatella, Rosaria; Smith, Anthony D. M.; Stokes, Kevin; Thoegersen, Thomas; Ulrich, Clara.
This study compares the details and performance of fisheries management between the EU and a selection of other countries worldwide: Iceland, New Zealand, and Australia, which are considered in many respects to be among the most advanced in the world in fisheries management. Fisheries management in the EU, Iceland, Australia, and New Zealand has developed following different paths, despite being based on similar instruments and principles. Iceland, Australia, and New Zealand have been at the forefront of developing management practices such as stakeholder involvement, legally binding management targets (Australia, New Zealand), individual transferable quotas, and discard bans (Iceland, New Zealand). The EU has since the beginning of the 21st century taken...
Tipo: Text
Palavras-chave: Australia; Comparative review; European Union; Fisheries management; Iceland; New Zealand.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00312/42305/41699.pdf

How to provide scientific advice for ecosystem-based management now
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Trenkel, Verena.
n this paper, I argue that we have at hand what is needed to provide scientific advice for ecosystem-based management of small pelagics and other species groups now. The ingredients for this advice are (i) large marine ecosystems as spatial management units; (ii) maintaining ecosystem productivity and exploiting at multispecies maximum yield as overarching management objectives; (iii) assessment of ecosystems by evaluating changes in primary productivity; (iv) an operational management procedure in which single-species catch proposals are adjusted to ecosystem productivity using a set of control rules. Inspection of historic landings for small pelagics and other small species in the Northeast Atlantic (ICES area) reveals that most likely fisheries...
Tipo: Text
Palavras-chave: EBFM; Fisheries management; Fisheries yield; Primary production.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00416/52784/53851.pdf

Testing CPUE-derived spatial occupancy as an indicator for stock abundance: application to deep-sea stocks
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Trenkel, Verena; Beecham, Jonathan A.; Blanchard, Julia L.; Edwards, Charles T. T.; Lorance, Pascal.
The status of an exploited population is ideally determined by monitoring changes in abundance and distributional range and pattern over time. Area of occupancy is a measure of the current distribution. Unfortunately, for many populations, scientific abundance and distribution information is not readily available. To evaluate the reliability of commercial fishing data for deriving occupancy indicators that could serve as proxies for stock abundance, we investigated four questions: 1) Occupancy changes with stock biomass, but is this change strong enough to make occupancy a sensitive indicator of population biomass? 2) Fishing boats follow fish, but when does such activity alter the positive macroecological relationship between occupancy and abundance? 3)...
Tipo: Text
Palavras-chave: Catch per unit effort; Spatial patterns; Macroecology; Fisheries management; Marine Strategy Framework Directive; MSFD.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00176/28759/27232.pdf

Sensitivity of marine systems to climate and fishing: Concepts, issues and management responses
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Perry, R. Ian; Cury, Philippe; Brander, Keith; Jennings, Simon; Moellmann, Christian; Planque, Benjamin.
Modern fisheries research and management must understand and take account of the interactions between climate and fishing, rather than try to disentangle their effects and address each separately. These interactions are significant drivers of change in exploited marine systems and have ramifications for ecosystems and those who depend on the services they provide. We discuss how fishing and climate forcing interact on individual fish, marine populations, marine communities, and ecosystems to bring these levels into states that are more sensitive to (i.e. more strongly related with) climate forcing. Fishing is unlikely to alter the sensitivities of individual finfish and invertebrates to climate forcing. It will remove individuals with specific...
Tipo: Text
Palavras-chave: Climate variability; Climate change; Communities; Ecosystems; Fisheries management; Fishing; Populations.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00000/11141/9343.pdf

The key role of the Northern Mozambique Channel for Indian Ocean tropical tuna fisheries
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chassot, Emmanuel; Bodin, Nathalie; Sardenne, Fany; Obura, David.
The Northern Mozambique Channel (NMC) is a tropical area of similar to 1 million km(2) where pelagic fisheries supply proteins to more than 9 million people living in Comoros, Mayotte, and along the coasts of Mozambique, Tanzania and Madagascar. Although uncertain, statistics suggest that about 20,000 mt of tropical tuna and other pelagic fish are annually caught by artisanal fisheries in the area. The NMC is also a major seasonal fishing ground for high-seas fleets that export an annual average catch of more than 20,000 mt to tuna can and sashimi markets of high-income countries for a value estimated to be more than 100 million USD. The fisheries productivity of the NMC appears to be highly variable in relation to strong annual and seasonal variability in...
Tipo: Text
Palavras-chave: Bigeye; Fisheries management; Mozambique Channel; Skipjack; Yellowfin.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00512/62366/66661.pdf

Fisher Behaviour and Economic Interactions Between Fisheries: Examining Seaweed and Scallop Fisheries of the Brest District (Western Brittany, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Kervarec, Fabienne; Arzel, Pierre; Guyader, Olivier.
This papers aims at understanding the strategies of fishers operating two fisheries which are biologically independent but economically interrelated. The case studied is that of the fishers who dredge scallops, queens and clams in the bay of Brest during winter, and harvest the Laminaria digitata field in the open sea, north-west of Brest in summer. Taking this peculiarity into account, the paper makes a distinction between different strategies, which enable fishers to adapt to a changing environment (abundance variation but also economic and institutional shifts) during recent years. Fishers have to choose among different activities, which bring about various investments. Vice versa, their behaviour has feedback effects on the global institutional...
Tipo: Text
Palavras-chave: Fisher behaviour; Fisheries management; Seaweed harvesting; Scallop dredging.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00243/35412/33939.pdf

Spatial distribution of discards in mixed fisheries: species trade-offs, potential spatial avoidance and national contrasts
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Robert, Marianne; Calderwood, Julia; Radford, Zachary; Catchpole, Tom; Reid, David G.; Pawlowski, Lionel.
Since 2015, the European Union gradually implemented the landing obligation (LO). This prohibits at-sea discarding of species under total allowable catch management. Spatiotemporal avoidance strategies and increasing fishing gear selectivity are two complementary levers that could help fishers in reducing the amount of discards. The objective of this paper is to analyse discarding practices of demersal mixed fisheries in the central part of the Celtic Sea to inform on potential spatial avoidance strategies of unwanted catches in a multi-species context. This study provides the first international and fine scale discard maps based on combined observer at-sea data from Ireland, France and the UK, the main countries fishing in the area. Using a suite of...
Tipo: Text
Palavras-chave: Fisheries management; Landing obligation; Discards; Mixed fisheries; Celtic Sea.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00515/62641/67029.pdf

The added value of participatoly modelling in fisheries management - what has been learnt?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Rockmann, Christine; Ulrich, Clara; Dreyer, Marion; Bell, Ewen; Borodzicz, Edward; Haapasaari, Paivi; Hauge, Kjellrun Hiis; Howell, Daniel; Mantyniemi, Samu; Miller, David; Tserpes, George; Pastoors, Martin.
How can uncertain fisheries science be linked with good governance processes, thereby increasing fisheries management legitimacy and effectiveness? Reducing the uncertainties around scientific models has long been perceived as the cure of the fisheries management problem. There is however increasing recognition that uncertainty in the numbers will remain. A lack of transparency with respect to these uncertainties can damage the credibility of science. The EU Commission's proposal for a reformed Common Fisheries Policy calls for more self-management for the fishing industry by increasing fishers' involvement in the planning and execution of policies and boosting the role of fishers' organisations. One way of higher transparency and improved participation is...
Tipo: Text
Palavras-chave: Participatory modelling; Fisheries management; Uncertainty; Post-normal science; Extended peer review; Problem framing.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00589/70104/68121.pdf

Low fuel cost and rising fish price threaten coral reef wilderness
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Januchowski‐hartley, Fraser A.; Vigliola, Laurent; Maire, Eva; Kulbicki, Michel; Mouillot, David.
Wilderness areas offer unparalleled ecosystem conditions. However, growing human populations and consumption are among factors that drive encroachment on these areas. Here, we explore the threat of small‐scale fisheries to wilderness reefs by developing a framework and modeling fluctuations in fishery range with fuel costs and fish prices. We modeled biomass of four fishery groups across the New Caledonian archipelago, and used fish and fuel prices from 2005 to 2020 to estimate the extent of exploited reefs across three fishing scenarios.  From 2012 to 2018, maximum profitable range increased from 15 to over 30 hr from the capital city, expanding to reefs previously uneconomic to fish, including a UNESCO heritage site. By 2020, over half of New Caledonian...
Tipo: Text
Palavras-chave: Coral reef conservation; Fisheries management; Reef accessibility; Small‐scale fisheries; South Pacific.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00607/71887/70585.pdf

Addressing transdisciplinary and participation issues to cope with rapid changes shifting marine social ecological systems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Guillotreau, Patrice; Trouillet, Brice; Mahévas, Stephanie; Pardo, Sophie.
This special section is derived from an international transdisciplinary Conference (OCEANEXT) held in 2016. It aimed at contributing to explore new initiatives mixing up scientific expertise and a participatory approach of stakeholders. This conference also ended the COSELMAR project (2013–2017), having brought together almost 170 researchers and resulted in 360 publications and communications. In this special issue, a panel of few communications were converted into peer-reviewed contributions focusing on the need for effective monitoring ahead of potential outbreaks to enhance the adaptive conditions for coastal communities and for more participation of stakeholders in the governance of social ecological marine systems. These few examples witness that...
Tipo: Text
Palavras-chave: Marine research; Coastal hazards; Coastal flood; Risks perception; Citizen sciences; Fisheries management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00615/72733/71905.pdf

Spatial management of inshore areas: Theory and practice
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Claudet, Joachim; Roussel, S; Pelletier, Dominique; Rey Valette, Hélène.
Coastal uses have deeply evolved these last decades and high anthropogenic pressures on coastal ecosystems have affected the sustainability of these areas with respect to the services and the resources they may provide. Traditional fisheries management has failed to avoid overexploitation of most coastal marine resources. Management measures based on an Integrated Coastal Zone Management (ICZM) are thus required. Spatial management covers various ranges of properties that may enhance usual regulatory means. If spatial considerations are explicitly integrated in fisheries management, the latter may contribute to zoning design in order to balance the economic, social and biological values of natural marine resources. While traditional fisheries management...
Tipo: Text
Palavras-chave: Spatial management; Coastal resources; Marine protected areas MPAS; Management ICZM; Integrated coastal zone; Fisheries management; Ecology; Ecological economics.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2598.pdf

Towards an ecosystem approach to fisheries management (EAFM) when trawl surveys provide the main source of information
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cotter, John; Petitgas, Pierre; Abella, Alvaro; Apostolaki, Panayiota; Mesnil, Benoit; Politou, Chrissi-yianna; Rivoirard, Jacques; Rochet, Marie-joelle; Spedicato, Maria Teresa; Trenkel, Verena; Woillez, Mathieu.
Ideas and considerations are put forward for managing fisheries and marine populations using primarily trawl surveys to supply biological and spatial indicators of the state of stocks, and to permit catch per unit effort (CPUE)-based assessments. Trawl surveys seldom allow absolute estimates of fish population sizes but, if appropriately located, timed, and designed, can provide a broad range of information about catchable fish species and the ecosystem that supports them. This information may be more conducive to sustainable management of fisheries than the traditional focus on the abundances of selected stocks. The paper first briefly proposes how survey-based methods might supplement existing fishery-dependent stock assessments, as would be necessary...
Tipo: Text
Palavras-chave: Fishing effort indicator; Fisheries independent assessment; Survey based stock assessment; Spatial indicator; State indicator; Trawl survey; Fisheries management.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6691.pdf

Individual transferable quota contribution to environmental stewardship: a theory in need of validation
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Van Putten, Ingrid; Boschetti, Fabio; Fulton, Elizabeth A.; Smith, Anthony D.m.; Thebaud, Olivier.
We explored the extent to which (1) individual transferable quotas (ITQs) may lead to changes in environmental stewardship and (2) environmental stewardship may in turn contribute to explain the success or otherwise of ITQs in meeting sustainability objectives. ITQs are an example of incentive-based fisheries management in which fishing rights can be privately owned and traded. ITQs are aimed at resolving the problems created by open-access fisheries. ITQs were proposed to promote economic efficiency, and there is growing empirical evidence that ITQs meet a number of economic and social fisheries management objectives. Even though improved stock status arises as a consequence of the total allowable catch levels implemented together with ITQs, the effect is...
Tipo: Text
Palavras-chave: Comanagement; Environmental ethics; Fisheries management; Fishing rights; Stewardship.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00250/36165/34720.pdf

Quota allocation in mixed fisheries: a bioeconomic modelling approach applied to the Channel flatfish fisheries
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Marchal, Paul; Little, L. Richard; Thebaud, Olivier.
A simulation modelling approach is used to assess the respective performances of different regimes of quota allocation (fixed or transferable), quota ownership (owned or not by fishers), and taxation for catching fish above quota. The simulations account for a variety of fleet behaviours (ranging from fixed by tradition to dynamic economics-driven). The modelling framework is applied to the Channel flatfish mixed fisheries. Transferable quota allocation regimes would particularly benefit small netters and beam trawlers, which would achieve a profit of (sic)50-150 million without compromising the conservation of eastern Channel sole, but it could impair the sustainability of other stocks. If quota is owned by fishers, the least fishing-efficient fleet stops...
Tipo: Text
Palavras-chave: Channel flatfish mixed fisheries; Fisheries management; Fleet dynamics; Individual quotas; Overquota landing tax; Plaice (Pleuronectes platessa); Sole (Solea solea).
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00044/15492/12971.pdf

Functional differences between fish communities on artificial and natural reefs: a case study along the French Catalan coast
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Koeck, Barbara; Tessier, Anne; Brind'Amour, Anik; Pastor, Jeremy; Bijaoui, Benjamin; Dalias, Nicolas; Astruch, Patrick; Saragoni, Gilles; Lenfant, Philippe.
In the context of growing anthropogenic disturbances that deeply alter marine coastal ecosystems, various management tools are used to protect biodiversity, such as fishing gear limitations, fishing quotas, protected areas or the creation of artificial reefs (ARs). In contrast to the other management tools, ARs require a modification of natural habitats. We used underwater visual censuses to investigate the effect of habitat modification on the structure of fish communities by comparing a natural reef (NR) to ARs with different habitat complexity. Different fish assemblage descriptors were used to assess species- and functional- and community-level aspects of the assemblages. ARs were rapidly colonized by adult fishes and presented community compositions...
Tipo: Text
Palavras-chave: Ecological niche; Fish community; Fisheries management; Functional diversity; Gulf of Lion; Habitat complexity; Mediterranean Sea; Underwater visual census.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00189/30029/28514.pdf

Towards the implementation of an integrated ecosystem fleet-based management of European fisheries
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gascuel, Didier; Merino, G.; Doering, R.; Druon, Jean-noel; Goti, L.; Guenette, S.; Macher, Claire; Soma, K.; Travers-trolet, Morgane; Mackinson, Steve.
Using the Celtic Sea and the North Sea as case studies, the fleet-based approach is shown to be the pathway to implement an effective ecosystem approach to fisheries management (EAFM) in European seas. First, a diagnostic on the health of each ecosystem is proposed based on the reconstruction of long time-series of catch, the analysis of mean indicators or stocks trajectories derived from ICES stock assessment results, and the analysis of ecosystem indicators. Then, a fleet-based synthesis is presented using indicators of both the ecological impact and the economic performances of the major fleets operating within each ecosystem. In particular, assessment diagrams show whether each fleet segment, on average, sustainably exploits the stocks. Although...
Tipo: Text
Palavras-chave: Ecosystem approach; Economic performance; Fisheries management; Fleet; Indicator; Sustainable development.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00075/18601/16179.pdf

From model-based prescriptive advice to indicator-based interactive advice
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Trenkel, Verena; Rochet, Marie-joelle; Mesnil, Benoit.
Traditional advice for fisheries management, especially in the ICES world, focuses on short-term stock projections relative to reference points. Primarily, two numbers, spawning-stock biomass and fishing mortality rate, are considered in the advice, although a range of biological processes are included in the stock assessment models. We propose an alternative form of final advice that would not rely on stock predictions and only two numbers, but on a suite of indicators that are combined to provide stock assessment and management advice. For a single stock, the approach consists of monitoring a set of indicators of population state and fishing pressure. Stock reference status at some time in the past is assessed, based on these indicators and/or other...
Tipo: Text
Palavras-chave: Scientific advice; Indicators; Fisheries management.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2619.pdf

Distributional issues in the operation of rights-based fisheries management systems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Guyader, Olivier; Thebaud, Olivier.
Rights-based management regimes are considered by economists as an important solution to the problems of excess capacity and biological over-harvesting of fisheries. In practice, adoption of such regimes, and particularly of those relying on individual quota allocations, has often met with resistance from within the fisheries concerned. A key reason for this resistance appears to be the distributional conflicts which arise in the process of implementing the regimes. An economic analysis of the nature of these conflicts in the different contexts in which they have been observed is proposed. The approach centres on the way in which distributional conflicts can influence the operation of management systems and their impacts on fisheries, from the country to...
Tipo: Text
Palavras-chave: Fisheries management; Rights-based management; Individual transferable quotas; Distributional issues; Economic simulation.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00244/35524/34808.pdf

Catch-quota balancing in mixed-fisheries: a bio-economic modelling approach applied to the New Zealand hoki (Macruronus novaezelandiae) fishery
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Marchal, Paul; Francis, Chris; Lallemand, Philippe; Lehuta, Sigrid; Mahevas, Stephanie; Stokes, Kevin; Vermard, Youen.
Managing adequately the exploitation of commercial species subject to technical interactions is a key step towards the ecosystem approach to fisheries. We evaluate here, using a bio-economic modelling approach building on the ISIS-Fish simulation platform, the relative impact of total allowable commercial catches (TACC) and of taxes applicable to over-quota landings (deemed value) on the sustainability of a selection of species exploited by the New Zealand hoki (Macruronus novaezelandiae) fishery. We investigate some aspects of the hoki mixed fisheries, consisting of four fleets and nineteen metiers, by considering the technical interactions between hoki and Southern hake (Merluccius australis). The dynamics of effort allocation were modelled using gravity...
Tipo: Text
Palavras-chave: Fleet dynamics; New Zealand hoki fishery; Deemed value; Fisheries management.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11168/7521.pdf

Spatio-seasonal patterns of demersal fish communities on the French Guiana Coast
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Joncour, Anna; Blanchard, Fabian; Tagliarolo, Morgana.
Estuarine and coastal areas are often considered as hotspots due to their high diversity and ecological importance. However, communities living on those areas are often submitted to fishery and climate change pressures causing modifications on fish assemblages. French Guiana’s coastal shelf is characterised by warm waters with high turbidity and low salinity caused by the large river discharges from the Amazon and nearby estuaries. The high productivity of these areas supports fisheries and aquaculture activities. However, the structure and dynamics of coastal fish populations in French Guiana have seldom been studied. The aim of this study was to understand the effect of environmental conditions, as well as the influence of the coast and nearby estuaries...
Tipo: Text
Palavras-chave: French Guiana; Coastal community; Estuary; Diversity; Tropical waters; Fisheries management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00607/71929/73534.pdf

Ability of spatial indicators to detect geographic changes (shift, shrink and split) across biomass levels and sample sizes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Rufino, Marta; Bez, Nicolas; Brind'Amour, Anik.
Spatial indicators are widely used to monitor species and are essential to management and conservation. In the present study, we tested the ability of 11 spatial indicators to quantify changes in species’ geographic patterns: (1) spatial displacement of a patch of biomass (‘shift’), (2) a spatial decrease in a patch, accompanied either by a loss of biomass (‘shrink0’) or (3) a relocation of the same biomass (‘shrink1’), and (4) splitting of a patch into smaller patches (‘split’). The geographic changes were simulated by manipulating the spatial distributions of the demersal species (observed during bottom trawl surveys). Hence, the spatial distributions of the latter being used as input data on which the manipulations were done. Additionally, other aspects...
Tipo: Text
Palavras-chave: Spatial metrics; Monitoring; Marine conservation; Fisheries management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00625/73684/73148.pdf

Information on sellers and buyers characteristics: added value to explain price formation at primary fish markets in managed French scallop fisheries
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lesur-irichabeau, Gabrielle; Guyader, Olivier; Fresard, Marjolaine; Leroy, C.; Latouche, K.; Le Grel, L.
The aim of this article is to explore, through a hedonic approach, the factors that might explain the price variability for the French-managed fishery of scallop at primary fish markets. In addition to factors classically identified in the current literature like intrinsic product characteristics or markets situation, the characteristics of operators are tested. The relationships of loyalty between sellers and buyers, and market assiduity are notably considered.
Tipo: Text
Palavras-chave: Buyer and seller characteristics; Fisheries management; Hedonic price; Market behaviour; Market structure; Scallop; Q21; Q22; Q28; C10; L11.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00301/41252/40442.pdf

The role of technical protocols and partnership engagement in developing a decision support framework for fisheries management
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Macher, Claire; Bertignac, Michel; Guyader, Olivier; Frangoudes, Katia; Fresard, Marjolaine; Le Grand, Christelle; Merzereaud, Mathieu; Thebaud, Olivier.
In the context of the Common Fisheries Policy Reform, the implementation of multiannual management plans for fisheries and the annual quota negotiations between EU member states has generated a growing demand from stakeholders and managers for integrated advice that goes beyond the usual biological advice. This has led to the emergence of bio-economic tools and methods for the comparison of the biological, economic and social tradeoffs associated with alternative options for fisheries management. A Decision Support Framework (DSF) has been developed in this context, with the objective to tackle technical and methodological challenges to be able to provide bio-economic advices to support decision at national and European level. It is based on a partnership...
Tipo: Text
Palavras-chave: Participatory approach; Stakeholder engagement; Decision-support; Bio-economic modelling; Fisheries management; Impact assessment.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00445/55698/57395.pdf

Intersection-union tests for characterising recent changes in smoothed indicator time series
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Trenkel, Verena; Rochet, Marie-joelle.
Using indicator time series for assessment and management requires methods for characterising recent time trends. We propose an approach where first the indicator time series is smoothed using a generalised additive model with optimal selection of the degree of smoothness. Second an intersection-union test is carried out using two test statistics which are the occurrence of the global maximum (or minimum) within the most recent years and the signs of the estimated annual first derivatives of the smoothed indicator times series during the same period, including years with missing data. The proposed test is applied to fish abundance indices for the North Sea, for which it is they are able to pick up changes happening during the last 3-5 years in contrast to...
Tipo: Text
Palavras-chave: Composite test; Assessment; Fisheries management; Metrics; Time trend.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6234.pdf

Traits biologiques et exploitation du bar commun Dicentrarchus labrax (L.) dans les pêcheries françaises de la Manche et du golfe de Gascogne.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Fritsch, Manon.
Sea bass Dicentrarchus labrax (Linné, 1758) is a fish of major interest in France and in the British Isles. It is the main target species for some anglers and a growing number of professional fishermen. In spite of this, the reproduction of sea bass in natural environment, the identification of its populations, as well as the fleet participating to and the level of its exploitation are poorly known. Thus, in the perspective of a future management of the bass fisheries, this thesis collected required data for the analysis of the sea bass resource in the English Channel and the Bay of Biscay. A first chapter describes to the principal biological and ecological characteristics of Dicentrarchus labrax. The five following chapters deal successively with: (i)...
Tipo: Text
Palavras-chave: Fisheries management; Fisheries exploitation; Angling; Tagging; Microsatellite loci; Reproduction; Dicentrarchus labrax; Gestion de stocks; Exploitation; Pêche récréative; Pêcheries; Marquage; Marqueurs microsatellites; Reproduction; Dicentrarchus labrax.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-1088.pdf

A fleet-metier based approach of the small scale fishing activity in the French West Indies
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Guyader, Olivier; Reynal, Lionel; Demaneche, Sebastien; Berthou, Patrick; Daures, Fabienne.
The development of the ecosystemic approach for fisheries supposes to improve integrated analysis of fisheries by considering the biological as well as the socio-economic dimensions of the exploitation. A prerequisite for integrated analysis is the improvement in the knowledge of fleets structure, fleet evolution and allocation of fishing effort in the different fisheries. However, small scale fisheries are often characterized by a lack of knowledge on the vessel fishing activity. This paper first presents a data collection methodology recently applied in the French West (Guadeloupe and Martinique) for the follow up of the whole vessel population. Based on a statistical analysis of these data sets, the paper develops a fleet-metier matrix giving the...
Tipo: Text
Palavras-chave: Flottille; Métiers; Activité; Petite pêche; Gestion des pêches; Fleet; Metiers; Fishing activity; Small scale fisheries; Fisheries management.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00243/35456/33985.pdf

Fish wariness is a more sensitive indicator to changes in fishing pressure than abundance, length or biomass
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Goetze, Jordan S.; Januchowski-hartley, Fraser A.; Claudet, Joachim; Langlois, Tim J.; Wilson, Shaun K.; Jupiter, Stacy D.
Identifying the most sensitive indicators to changes in fishing pressure is important for accurately detecting impacts. Biomass is thought to be more sensitive than abundance and length, while the wariness of fishes is emerging as a new metric. Periodically harvested closures (PHCs) that involve the opening and closing of an area to fishing are the most common form of fisheries management in the western Pacific. The opening of PHCs to fishing provides a unique opportunity to compare the sensitivity of metrics, such as abundance, length, biomass and wariness, to changes in fishing pressure. Diver-operated stereo video (stereo-DOV) provides data on fish behavior (using a proxy for wariness, minimum approach distance) simultaneous to abundance and length...
Tipo: Text
Palavras-chave: Artisanal fisheries; Catch efficiency; Compliance; Conservation; Customary management; Fish behavior; Fisheries management; Flight initiation distance.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00610/72247/71050.pdf

Potential Economic Consequences of the Landing Obligation
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hoff, Ayoe; Frost, Hans; Andersen, Peder; Prellezo, Raul; Rueda, Lucia; Triantaphyllidis, George; Argyrou, Ioanna; Tsikliras, Athanassios; Motova, Arina; Lehuta, Sigrid; Curtis, Hazel; Rodriguez-rodriguez, Gonzalo; Ballesteros, Hugo M; Valeiras, Julio; Bellido, José Maria.
To assess the likely economic outcomes to fishing fleets of the Landing Obligation (LO), bioeconomic models covering seven European fisheries, ranging from the North East Atlantic to the Mediterranean, have been applied to estimate the economic performance of fleets before and after implementing the LO. It is shown that for most of the analysed fisheries, their economic outcome will be negatively affected in the long term by the LO, when compared to the expected outcome with no LO. Efficient mitigation strategies (exemptions, quota uplifts, improved selectivity, effort reallocation and others) may, for some of the analysed fisheries, reduce the negative economic effect of the LO. Moreover, the possibility to trade quotas, both nationally and...
Tipo: Text
Palavras-chave: Costs and earnings; Discards; Economic repercussions; Fisheries management; Fleet adjustment.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00473/58435/61010.pdf

Can fisheries-induced evolution shift reference points for fisheries management?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Heino, Mikko; Baulier, Loic; Boukal, David S.; Ernande, Bruno; Johnston, Fiona D.; Mollet, Fabian M.; Pardoe, Heidi; Therkildsen, Nina O.; Uusi-heikkila, Silva; Vainikka, Anssi; Arlinghaus, Robert; Dankel, Dorothy J.; Dunlop, Erin S.; Eikeset, Anne Maria; Enberg, Katja; Engelhard, Georg; Jorgensen, Christian; Laugen, Ane; Matsumura, Shuichi; Nussle, Sebastien; Urbach, Davnah; Whitlock, Rebecca; Rijnsdorp, Adriaan D.; Dieckmann, Ulf.
Biological reference points are important tools for fisheries management. Reference points are not static, butmay change when a population's environment or the population itself changes. Fisheries-induced evolution is one mechanism that can alter population characteristics, leading to "shifting" reference points by modifying the underlying biological processes or by changing the perception of a fishery system. The former causes changes in "true" reference points, whereas the latter is caused by changes in the yardsticks used to quantify a system's status. Unaccounted shifts of either kind imply that reference points gradually lose their intended meaning. This can lead to increased precaution, which is safe, but potentially costly. Shifts can also occur in...
Tipo: Text
Palavras-chave: Biological reference points; Fisheries-induced evolution; Fisheries management; Population dynamics; Precautionary approach; Uncertainty.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00151/26228/24302.pdf

The need for a protean fisheries science to address the degradation of exploited aquatic ecosystems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Drouineau, Hilaire; Lobry, Jeremy; Bez, Nicolas; Travers-trolet, Morgane; Vermard, Youen; Gascuel, Didier.
In this introductory paper we highlight key questions that were discussed during the symposium on “Status, functioning and shifts in marine ecosystems” organized by the Association Française d’Halieutique (French Association for Fisheries Sciences, Montpellier, France, July 2015). This symposium illustrated that fisheries science is now working at multiple scales and on all dimensions of socio-ecosystems (ecological, political, sociological, and economic), with a great diversity of approaches and taking into account different levels of complexity while acknowledging diverse sources of uncertainty. We argue that we should go one step further and call for a protean fisheries science to address the deteriorated states of aquatic ecosystems caused by...
Tipo: Text
Palavras-chave: EAFM; Fisheries management; Fisheries science; Marine resources; Models; Uncertainty.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00359/46990/46921.pdf

Sustainability of exploited marine ecosystems through protected areas: A viability model and a coral reef case study
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Doyen, L; De Lara, M; Ferraris, Jocelyne; Pelletier, Dominique.
Overexploitation of marine resources remains a problem worldwide. Many works advocate for the use of marine reserves as a central element of future stock management in a sustainable perspective. In the present paper, we address the influence of protected areas upon fisheries sustainability within an eco-systemic framework through a dynamic bio-economic model integrating a trophic web, catches and environmental uncertainties. The model is spatially implicit. The evaluation of the ecosystem is designed through the respect along time of constraints of both conservation and guaranteed captures. Using the mathematical concept of invariance kernel in a stochastic context, we define different MPA effects according to biodiversity catches or mixed points of view....
Tipo: Text
Palavras-chave: Invariance analysis; Co viability; Marine protected area; Fisheries management; Renewable resource; Marine ecosystems.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3510.pdf

Remote electronic monitoring and the landing obligation - some insights into fishers' and fishery inspectors' opinions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Plet-hansen, Kristian S.; Eliasen, Soren Q.; Mortensen, Lars O.; Bergsson, Heiorikur; Olesen, Hans J.; Ulrich, Clara.
The European fisheries management is currently undergoing a fundamental change in the handling of catches of commercial fisheries with the implementation of the 2013 Common Fisheries Policy. One of the main objectives of the policy is to end the practice of discarding in the EU by 2019. However, for such changes to be successful, it is vital to ensure stakeholders acceptance, and it is prudent to consider possible means to verify compliance with the new regulation. Remote Electronic Monitoring (REM) with Closed-Circuit Television (CCTV) has been tested in a variety of fisheries worldwide for different purposes and is currently considered as one possible tool to ensure compliance with a European ban on discards. This study focuses on Danish fishery...
Tipo: Text
Palavras-chave: Fisheries management; Discard ban; Compliance; Fully Documented Fisheries; Fishery inspectors; Interviews.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00589/70096/68090.pdf

Histology of Tritia mutabilis gonads: using reproductive biology to support sustainable fishery management
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Mallet, Alicia; Jouvenel, Jean-yves; Broyon, Morgane; Pirot, Nelly; Geffroy, Benjamin.
The mutable nassa, Tritia mutabilis, a marine gastropod that is widely exploited on the Adriatic coast is an important source of income for small-scale fishermen in the Mediterranean Sea, particularly in the Gulf of Lion. However, the lack of knowledge on the ecology and biology of this species limits our capacities to propose and produce an effective management plan. As a result, stocks are currently declining, especially in Italy. In order to optimize a management plan for this fishery, we designed a study to better characterize the reproductive biology of T. mutabilis, using gonad histology and performing a regular monitoring of population size frequency. The average shell height of individuals during the breeding period was 24 ± 2.7mm for males and 30...
Tipo: Text
Palavras-chave: Tritia mutabilis; Gonad histology; Gonochoric species; Size at first maturity; Fisheries management.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00686/79831/82637.pdf

Fish-length based indicators for improved management of the sardinella fisheries in Senegal
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Baldé, Bocar Sabaly; Fall, Massal; Kantoussan, Justin; Sow, Fambaye Ngom; Diouf, Malick; Brehmer, Patrice.
Fisheries management is difficult especially in developing countries where there are little or no data available for stock assessment. Here, a simple model based on the length-based Bayesian biomass (LBB) is applied to length frequencies collected on the two sardinella species (Sardinella maderensis and S. aurita) collected in Senegalese waters (2004 to 2014) to diagnose these stocks and to support the development of fishery management options that may improve the livelihoods of artisanal fishermen. Annual mean length of both species of sardinella showed a large variation during the decadal study period. It is assumed that such variations are due to environmental changes. According to our results, based on the current exploitation rate, both sardinella...
Tipo: Text
Palavras-chave: Data poor fisheries; Fisheries management; Shared stocks; Small scale fisheries; Small pelagic fish; West Africa.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00512/62318/67184.pdf

Adult-mediated connectivity and spatial population structure of sardine in the Bay of Biscay and Iberian coast
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Silva, Alexandra; Garrido, Susana; Ibaibarriaga, Leire; Pawlowski, Lionel; Riveiro, Isabel; Marques, Vitor; Ramos, Fernando; Duhamel, Erwan; Iglesias, Magdalena; Bryere, Philippe; Mangin, Antoine; Citores, Leire; Carrera, Pablo; Uriarte, Andres.
This work investigated adult-mediated connectivity and spatial population structure of sardine in the European Atlantic waters. The spatial and temporal progress of cohorts was modelled using abundance-at-age survey data by area in the period 2000 to 2016, covering the region from the northern Bay of Biscay to the eastern Gulf of Cadiz. A novel methodology was used to calculate indices of cohort movement between areas. Movement was relatively low between three large regions, the Bay of Biscay, the northern Spanish and Portuguese waters and the Gulf of Cadiz, each hosting a recruitment hotspot. On the other hand, one half of the sardines recruited in North Portugal and a quarter of those recruited in Southwest Portugal moved to northern Spanish waters and...
Tipo: Text
Palavras-chave: Metapopulation; Source-sink dynamics; Adult-mediated connectivity; Cohort dispersal; Small pelagic fishes; Stock identity; Fisheries management.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00465/57661/59856.pdf

Defining the stock structures of key commercial tunas in the Pacific Ocean II: Sampling considerations and future directions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Moore, Bradley R.; Adams, Tim; Allain, Valerie; Bell, Johann D.; Bigler, Mark; Bromhead, Don; Clark, Sangaa; Davies, Campbell; Evans, Karen; Faasili, Ueta; Farley, Jessica; Fitchett, Mark; Grewe, Peter M.; Hampton, John; Hyde, John; Leroy, Bruno; Lewis, Antony; Lorrain, Anne; Macdonald, Jed I.; Marie, Amandine D.; Minte-vera, Carolina; Natasha, Janice; Nicol, Simon; Obregon, Pablo; Peatman, Thomas; Pecoraro, Carlo; Phillip, N. Bradley; Pilling, Graham M.; Rico, Ciro; Sanchez, Caroline; Scott, Robert; Scutt Phillips, Joe; Stockwell, Brian; Tremblay-boyer, Laura; Usu, Thomas; Williams, Ashley J.; Smith, Niamh.
Delineating the stock structure of highly-mobile, wide-ranging fishes subject to exploitation is a challenging task, yet one that is fundamental to optimal fisheries management. A case in point are stocks of skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), bigeye tuna (Thunnus obesus) and albacore tuna (Thunnus alalunga) in the Pacific Ocean, which support important commercial, artisanal, subsistence, and recreational fisheries, and contribute roughly 70 % of global commercial tuna catches. Although some spatial and temporal structuring is recognised within these stocks, growing evidence from a range of approaches suggests that the stock structure of each tuna species is more complex than is currently assumed in both stock assessment...
Tipo: Text
Palavras-chave: Tuna; Pacific Ocean; Movement; Spatial dynamics; Stock structure; Fisheries management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00630/74168/73773.pdf

Do explicit criteria help in selecting indicators for ecosystem-based fisheries management?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Rochet, Marie-joelle; Rice, Jake.
An evaluation framework developed to help select an appropriate suite of indicators to support an ecosystem approach to fisheries management was tested experimentally by asking independent experts to weight the selection criteria provided and to score indicators against those criteria in several ecological settings. The steps in selecting indicators proved to be prone to subjectivity and value judgement, and differences in scores between experts were the main factor contributing to variability in evaluation results. Having to justify scores in a written document did not improve consistency among the experts. The framework, however, did enhance transparency by explicitly stating each issue to be addressed in the selection process, and by giving experts or...
Tipo: Text
Palavras-chave: Selection criteria; Indicators; Fisheries management; Ecosystems; Criteria weights.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-483.pdf

Ocean Futures Under Ocean Acidification, Marine Protection, and Changing Fishing Pressures Explored Using a Worldwide Suite of Ecosystem Models
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Olsen, Erik; Kaplan, Isaac C.; Ainsworth, Cameron; Fay, Gavin; Gaichas, Sarah; Gamble, Robert; Girardin, Raphael; Eide, Cecilie H.; Ihde, Thomas F.; Morzaria-luna, Hem Nalini; Johnson, Kelli F.; Savina-rolland, Marie; Townsend, Howard; Weijerman, Mariska; Fulton, Elizabeth A.; Link, Jason S.
Ecosystem-based management (EBM) of the ocean considers all impacts on and uses of marine and coastal systems. In recent years, there has been a heightened interest in EBM tools that allow testing of alternative management options and help identify tradeoffs among human uses. End-to-end ecosystem modeling frameworks that consider a wide range of management options are a means to provide integrated solutions to the complex ocean management problems encountered in EBM. Here, we leverage the global advances in ecosystem modeling to explore common opportunities and challenges for ecosystem-based management, including changes in ocean acidification, spatial management, and fishing pressure across eight Atlantis (atlantis.cmar.csiro.au) end-to-end ecosystem...
Tipo: Text
Palavras-chave: Ecosystem-based management; Fisheries management; Ocean acidification; Marine protected areas; Atlantis ecosystem model.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00428/53948/55094.pdf

Perceptions et attentes des professionnels de manche est vis a vis de l'ecosysteme qu'ils exploitent
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Prigent, Magali; Fontenelle, Guy.
The development of an ecosystemic approach to fisheries management requires the clear formulation of management objectives that make it possible to develop criteria to evaluate indicators. For an ecosystem, targets and limits are a matter of societal choice. Work to formulate these objectives is necessary. Within this perspective, this report presents a survey of the perceptions of Eastern English Channel fishing professionals on the state of the "marine ecosystem" resource. 29 people were polled during the month of June 2006 about their perceptions of the ecosystem as it was at a baseline time in the past, as it is today, and as it should be in future. Diagrams made it possible to formalise these perceptions.  The people who were polled noticed a...
Tipo: Text
Palavras-chave: Eastern English Channel; Fishing professional; Economy; Ecosystemic approach; Marine ecosystem; Fisheries management; Ecosystème marin; Gestion des pêches; Manche Est; Professionnel de la pêche; Economie; Approche écosystémique.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/rapport-2056.pdf

Area-based management and fishing efficiency
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Marchal, Paul; Ulrich, Clara; Pastoors, M.
The scope of this study is to investigate the extent to which area-based management may have influenced the fishing efficiency of the Danish and Dutch demersal fleets harvesting cod, plaice and sole in the North Sea. Special consideration is given to the 'plaice box', a restricted area where fishing is prohibited to towed-gear fleets of horsepower exceeding 300 hp. An index of fishing power is calculated as the log-ratio between the catch per unit effort (CPUE) of any vessel and some survey abundance index. Annual trends in fishing are calculated as the year-effect derived from a general linear model (GLM) analysis of the index of fishing power. The fishing efficiency of Danish gill-netters and, to some extent, Danish seiners, has overall increased inside...
Tipo: Text
Palavras-chave: Fishing efficiency; Plaice box; Fisheries management; North Sea; Demersal fisheries.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00589/70118/68112.pdf

Catalogue international des activités des flottilles de Manche, approche des interactions techniques
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Tetard, A; Boon, M; Bennett, D; Berthou, Patrick; Bossy, S; Casey, J; De Clerck, R; Delpech, Jean-paul; Dintheer, C; Giret, M; Large, P; Latrouite, Daniel; Lemoine, Michel; Millner, R; Morizur, Yvon; Ozanne, S; Palmer, D; Pawson, M; Pickett, G; Vince, M.
This work is the result of collaboration between the English, French, Channel Isles and Belgian laboratories which are involved in a study of the English Channel. Its subject is the activities of fleets and fleet interactions, and it complements other work on the biogeographical identification of Channel fish and shellfish stocks (published), and on modelling the fleets' interactions as they exploit the resources (in preparation). The concept of a métier is defined as being the use of one fishing gear to catch one or several species targeted during a particular season in a given area. On this basis, 74 métiers were identified during 1989-90. For each métier we give a brief description of the catching gear, the target species and most usual by-catch, the...
Tipo: Text
Palavras-chave: Fisheries management; Fishing effort; Technical interactions; English Channel; Métier; Gestion des pêcheries; Distribution de l'effort de pêche; Interactions techniques; Manche; Métiers.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/rapport-704.pdf

Catalogue international des activités des flottilles de Manche, approche des interactions techniques
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Tetard, A; Boon, M; Bennett, D; Berthou, Patrick; Bossy, P; Casey, J.
This work is the result of collaboration between the English, French, Channel Isles and Belgian laboratories which are involved in a study of the English Channel. Its subject is the activities of fleets and their interactions, and it complements other work on the biogeographical identification of Channel fish and shellfish stocks (published), and on modelling the fleets' interactions as they exploit theresources (in preparation). The concept of a metier is defined as being the use of one fishing gear to catch one or several species targeted during a particular season in a given area. On this basis, 74 metiers were identified during 1989-90. For each metier we give a brief description of the catching gear, the target species and most usual by-catch, the...
Tipo: Text
Palavras-chave: Fisheries management; Fishing effort; Technical interactions; English Channel; Metier; Gestion des pêcheries; Distribution de l'effort de pêche; Interactions techniques; Manche; Métiers.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/rapport-3836.pdf

Competition or cooperation in transboundary fish stocks management: Insight from a dynamical model
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Nguyen-trong, Hieu; Brochier, Timothee; Auger, Pierre; Trinh, Viet Duoc; Brehmer, Patrice.
An idealized system of a shared fish stock associated with different exclusive economic zones (EEZ) is modelled. Parameters were estimated for the case of the small pelagic fisheries shared between Southern Morocco, Mauritania and the Senegambia. Two models of fishing effort distribution were explored. The first one considers independent national fisheries in each EEZ, with a cost per unit of fishing effort that depends on local fishery policy. The second one considers the case of a fully cooperative fishery performed by an international fleet freely moving across the borders. Both models are based on a set of six ordinary differential equations describing the time evolution of the fish biomass and the fishing effort. We take advantage of the two time...
Tipo: Text
Palavras-chave: Shared fish stock; Aggregation of variables; ODE; Pelagic; Fisheries management; West Africa.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00442/55310/72108.pdf

Can the Threat of Economic Sanctions Ensure the Sustainability of International Fisheries? An Experiment of a Dynamic Non-cooperative CPR Game with Uncertain Tipping Point
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Selles, Jules; Bonhommeau, Sylvain; Guillotreau, Patrice; Vallee, Thomas.
Complex dynamic systems such as common-pool resource systems can undergo a critical shift at a given threshold, the so-called tipping point, which potentially requires substantial changes from the management system. We present in this research a framed laboratory experiment design to examine how the threat of economic sanctions influences the strategic management of a common-pool resource. We use the context of the East Atlantic bluefin tuna international fishery as it has been the archetype of an overfished and mismanaged fishery until a dramatic reinforcement of its regulations followed the threat of a trade ban. We consider endogenous threats and examine their effects on cooperation through harvest decisions taken in the context of non-cooperative game...
Tipo: Text
Palavras-chave: Common-pool resources; Experimental economics; Fisheries management; International fisheries; Policy making; Tipping points.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73488/72786.pdf

A cost-benefit analysis of improving trawl selectivity in the case of discards: The Nephrops norvegicus fishery in the Bay of Biscay
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Macher, Claire; Guyader, Olivier; Talidec, Catherine; Bertignac, Michel.
The Nephrops trawl fishery is one of the most important fisheries in the Bay of Biscay. The fishery management essentially relies on conservation measures, a total at I owed catch (TAC) for Nephrops together with a mini mum landing size (MLS) and minimum trawl mesh size (70 mm stretched mesh). These measures have failed to prevent high discard levels of many species that characterize the fishery. Nephrops trawlers thus discard about half of their Nephrops catches in numbers (a third in weight) of which only 30% survive. Nephrops discards mainly occur in younger Nephrops age groups below the MLS. This is a waste for the already overexploited Nephrops stock as well as for the fleet. Based on a bio-economic simulation model, the paper analyses the...
Tipo: Text
Palavras-chave: Fisheries management; Discards; Selectivity; Cost benefit analysis; Bio economic simulations; Nephrops norvegicus.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4478.pdf

A classification scheme for deep seafloor habitats
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Greene, Hg; Yoklavich, Mm; Starr, Rm; O'Connell, Vm; Wakefield, Ww; Sullivan, De; Mcrea, Je; Cailliet, Gm.
A standard, universally useful classification scheme for deepwater habitats needs to be established so that descriptions of these habitats can be accurately and efficiently applied among scientific disciplines. In recent years many marine benthic habitats in deep water have been described using geophysical and biological data. These descriptions can vary from one investigator to another, which makes it difficult to compare habitats and associated biological assemblages among geographic regions. Using geophysical data collected with a variety of remote sensor systems and in situ biological and geologic observations, we have constructed a classification scheme that can be used in describing marine benthic habitats in deep water.
Tipo: Text
Palavras-chave: Habitat; Classification universelle; Benthique; Gestion des pêcheries; Habitat; Universal classification; Benthic; Fisheries management.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43590/44030.pdf

Le Dispositif de Concentration de Poissons (DCP): une alternative à la forte pression de pêche sur les ressources récifales de la Martinique
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Taquet, Marc.
This paper describes the fishing activity in Martinique, French West Indies. It draws up the balance sheet of acquirements about marine resources of the island. The difficulties of fisheries management are discussed with reference to biologists and economists works in the last ten years. We also show how management efforts to decrease fishing pressure on reef resources has induced the implantation of a new technology: the Fish Aggregating Deviee. The differing histories of development of FADs in the French West Indies are compared. The positive results from the introduction of the FADs and the estimated risks due to the transferance of fishing pressure on the continental shelf is presented. The use of FADs to enhance the exploitation of marine resources is...
Tipo: Text
Palavras-chave: DCP; Gestion des pêches; Martinique; FAD; Fisheries management; Martinique.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00113/22409/20106.pdf

Technological Development and Fisheries Management
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Eigaard, Ole Ritzau; Marchal, Paul; Gislason, Henrik; Rijnsdorp, Adriaan D.
Many marine fish stocks are overexploited and considerable overcapacity exists in fishing fleets worldwide. One of the reasons for the imbalance between resource availability and fishing capacity is technological development, which continuously increases the efficiency of the vessels—a mechanism referred to as “technological creep.” We review how the introduction of new and more efficient electronic equipment, gear design, engines, deck equipment, and catch-handling procedures influences the capture efficiency (catchability) of commercial fishing vessels. On average, we estimate that catchability increases by 3.2% per year due to technological developments, an increase often ignored in fisheries management. The documentation and quantification of...
Tipo: Text
Palavras-chave: Catchability; Fishing mortality; Fishing power; Fisheries management; Fleet capacity; Technological development.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00222/33368/35784.pdf

Modélisation biophysique pour la prévision du recrutement
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Allain, Gwenhael.
Exploited fish populations are dependent on recruitment (i.e. size of the new year class) to sustain their abundance. Recruitment variations are related to hydroclimatic variations and may accentuate the detrimental effects of fishing. Recruitment prediction requires accurate fisheries oceanographic tools, which are expected to be more reliable than large-scale correlation analyses between fish abundance and climate variables.  Recruitment is the result of the integration over a season and large oceanic areas of processes affecting larval survival, which are dependent on small-scale mechanisms. Hydrodynamic models are a tool to perform this integration. This thesis aims at exploring and modelling physical-biological interaction mechanisms in order to...
Tipo: Text
Palavras-chave: Anchovy; Upwelling; Turbulence; Retention; Fisheries management; Population dynamics; Stock environment interaction; Stock recruitment relation; Scale integration; Individual based models; Survival; Growth; Otolith; Physical biological interactions; Prediction; Recruitment; Turbulence; Rétention; Méso échelle; Intégration des échelles; Modèle de survie; Modèle de ponte; Modèles individu centrés; Modèles de corrélation; Modèles stochastiques; Juvéniles; Larves; Otolithe; Modèle de croissance; Interactions physique biologie; Prévision; Recrutement.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/these-5.pdf

Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary
Provedor de dados: Neotropical Ichthyology
Autores: Giglio,Vinicius J.; Bornatowski,Hugo.
ABSTRACT Coastal hammerheads have suffered from overexploitation and environmental degradation. We interviewed 79 artisanal fishers to verify fishery aspects, temporal changes in catches and biological aspects of the smalleye hammerhead, Sphyrna tudes , in a marine protected area on Abrolhos Bank, Brazil. Data were compared between three generations of fishers: young, middle-aged and old. Fishers' age varied between 17 and 88 years. We verified significant reductions in the weight of individuals caught by younger fishers. The main types of fishing gear used to catch S. tudes were gill nets and longlines. Overfishing through gill nets and trawl fisheries were mentioned as the cause of S. tudes population collapse in the region. The shark's diet as reported...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abrolhos Bank; Artisanal fishing; Coastal shark; Elasmobranch; Fisheries management.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200203

Pêcherie démersale côtière au Sénégal. Essai de modélisation de la dynamique de l'exploitation des stocks
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Institut de Recherche pour le Développement, Paris (France); Fall, Massal.
Français - Les traits essentiels de la côte sénégalaise, repères historiques de la pêche, communautés de pêcheurs, caractéristiques des flottes et modes d’accès à la ressource et d’interaction sont analysés. Les caractéristiques, tendances décroissantes de l’abondance,niveaux d’exploitation, mesures d’aménagement, relations interspécifiques, changements potentiels et sources de variation des stocks démersaux côtiers sont précisés. Les notions de tactiques et stratégies de pêche sont passées en revue, conceptualisées puis étudiées.Le modèle «Dynamique Conjointe Exploitation Ressource» utilisé repose sur la définition de 4 typologies. L’utilisation de méthodes de classification et de connaissances d’experts conduit à considérer 32 stocks, 31 strates, 82...
Tipo: Theses and Dissertations
Palavras-chave: Fisheries; Demersal fisheries; Modelling; Stocks; Ecosystems; Community fishing; Inland waters; Marine water; Hydrologic cycle; Fishermen; Fishing fleet; Shrimp fisheries; Capture fisheries; Fisheries management; Trawling; Artisanal fishing; Fishing licenses.
Ano: 2009
URL: http://hdl.handle.net/1834/5004

Report of the EAF REGIONAL TASK GROUP MEETING AND ECOLOGICAL RISK ASSESSMENT METHODOLOGY WORKSHOP (SOUTH WEST INDIAN OCEAN)
Provedor de dados: Ocean Docs: e-repository of  publications
The first meeting of the South West Indian Ocean EAF Regional Task Group (RTG) was held in Mombasa, Kenya, from 27 to 30 January 2009, together with an ecological risk assessment methodology workshop. It was attended by 20 partic ipants from the South West Indian Ocean (SWIO) countries, the South West Indian Ocean Fisheries Project (SWIOFP), the Agulhas and Somali Currents Large Marine Ecosystems (ASCLME) project, the Scientific Committee of the South West Indian Ocean Fisheries Commission, the United Nations Environment Programme (UNEP)/Nairobi Convention Implementation Unit, the African Union Commission and FAO. The RTG is an implementation structure under the EAF-Nansen project GCP/INT/003/NOR and serves as the forum for training in ecological risk...
Tipo: Report
Palavras-chave: Ecosystems; Fishery resources; Fisheries management; Ecosystems; Fisheries.
Ano: 2009
URL: http://hdl.handle.net/1834/5320

Social Literature Review for the Knowledge in Fisheries Management Project
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Wilson, D.C.
Fisheries co-management has two agendas associated with it that sometimes work together and sometimes contend. The first agenda is to make fisheries management more rational, meaning making it better able to achieve its objectives. The second agenda is to make fisheries management more equitable by giving those people who have the most at stake in management decisions a greater say in those decisions. The knowledge on which co-management is based plays a critical role in both of these agendas. If the knowledge needed for management, for example about the condition of a fish stock, is more realistic and easier to get, this helps management to be more rational. If the knowledge needed for management is contributed to, shared and controlled by more...
Tipo: Working Paper
Palavras-chave: Small scale fishing; Fisheries management.
Ano: 2001
URL: http://hdl.handle.net/1834/621

Overview of Management and Exploitation of the Fisheries Resources of Cameroon, Central West Africa
Provedor de dados: Ocean Docs: e-repository of  publications
This report discusses the present status of the Cameroon Fisheries regulation with respect to the United Nations Convention on the Law of the Sea (UNCLOS) and other International Conventions notably, the International Plan of Action-Illicit, Undeclared, Unregulated fishing (IPOA-IUU). It presents an overview of the fisheries resources of Cameroon analyzing fish production, management, exploitation, postharvest treatment, fish transport, commercialization and consumption. Major threats to sustainable exploitation and management are also herein discussed. Results reveal that the United Nations Convention on the Law of the Sea (UNCLOS) and other International Conventions do impose significant new commitments to the Cameroon fisheries legislation and that...
Tipo: Report
Palavras-chave: Commercial fishing; Fisheries management; Fisheries regulations.
Ano: 2011
URL: http://hdl.handle.net/1834/5228

International Instruments for Managing Fisheries in the Indian Ocean
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Willmann, R.
The paper sets out with a brief review of the status of marine fishery resources and the principal fisheries management issues in the Indian Ocean region. It then presents important international instruments for fisheries management and, in general terms, reviews progress in their implementation. The term ‘international’ is defined broadly to also encompass the conventions of regional or sub-regional fisheries management organizations (RFMOs). The paper focuses on fisheries management in the conventional sense of making optimum use of the fishery resources. Instruments addressing the protection of fish habitats from pollution and degradation are also addressed but in less detail.
Tipo: Conference Material
Palavras-chave: Fisheries management.
Ano: 2001
URL: http://hdl.handle.net/1834/854

Evaluation of the Status of the Namibian Hake Resource (Merluccius spp.) Using Statistical Catch-at-Age Analysis
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Kirchner, Carola; Kainge, Paul; Kathena, Johannes.
Namibian hake is the most important fish resource in Namibia. This monograph is a compilation of all the hake data, historic and recent, that has been used to inform stock assessment and management since the late 1970s. It presents the statistical catch-at-age analysis used to evaluate the state of the Namibian hake resource under different assumptions. This analysis treats the two hakes, Merluccius paradoxus and M. capensis, as a single stock. The data and modeling show that the stock has not as yet recovered to its maximum sustainable yield level, despite foreign fishing effort having been removed in 1990. Best estimates suggest the current stock to be roughly 20% of pre-exploitation levels; however this figure is sensitive to model assumptions. Signs...
Tipo: Book Section
Palavras-chave: Stock assessment; Gadoid fisheries; Data; Dynamics; Surveys; Commercial species; Total allowable catch; Biomass; Trawls; Otoliths; Fishing mortality; Fisheries management; Reproductive system.
Ano: 2012
URL: http://hdl.handle.net/1834/5166

Participation in Fisheries Management for Improved Livelihoods of Artisanal Fisheries Communities in West Africa
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Cacaud, P.; Lenselink, N.
A number of trends can be identified which are conducive to increased collaboration between fishers and government in fisheries management measures, as well as for an increased attention for livelihoods aspects. On the fishers’ side there are already existing (though not generally ‘traditional’) rules and committees governing fishing and there is an increasing awareness in communities for the need to protect stocks. The government has increasing interest in artisanal fisheries and already existing processes of consultation with fishers for the elaboration of management measures. In addition there are ongoing decentralisation processes which promote sharing of responsibilities with local institutions for the management of natural resources and already...
Tipo: Working Paper
Palavras-chave: Fisheries management; Artisanal fishing.
Ano: 2001
URL: http://hdl.handle.net/1834/331

Aménagement des pêcheries maritimes artisanale au Sénégal: bilan et perspectives
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Diouf, Sidiya.
Tipo: Theses and Dissertations
Palavras-chave: Fisheries management; Maritime space; Stocks; Fishing gear; Fishing zone; Artisanal fishing.
Ano: 2006
URL: http://hdl.handle.net/1834/4999

A Fisheries Co-management Case Study from The Gambia
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Njie, M.; Mikkola, H.
User involvement in fisheries management has been around for some time, but few analytical papers have been published on the subject in Africa. Most of these initiatives fall under the rubric of co-management. But what is the concept of co-management in theory and how does it work in practice? In reviewing a comprehensive artisanal fisheries development project, we will attempt to answer this question in the context of The Gambia.
Tipo: Journal Contribution
Palavras-chave: Fisheries management.
Ano: 2001
URL: http://hdl.handle.net/1834/342

Promotion of coastal fisheries management. 1. Local-level effort regulation in Senegalese fisheries.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Gaspart, F.; Platteau, J.P.
The analytical framework used throughout most of this study is directly inspired from transaction-cost economics, implying that a lot of attention is devoted to monitoring and enforcement costs involved in collective schemes. One of its most important contributions is to show that, with the help of these tools combined with conventional market power considerations, successes and failures of different groups of fishermen according to their technique and site of operation can be well accounted for. The outline is as follows. In Section 1, background information regarding Senegalese small-scale marine fisheries are provided and the methodology of the study based on cross-section data is shortly described. In Section 2, an historical sketch of all recent...
Tipo: Report
Palavras-chave: Coastal fisheries; Fisheries management.
Ano: 2000
URL: http://hdl.handle.net/1834/686

Towards the development of environmental indices for the Namibian shelf, with particular reference to fisheries management.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Bartholomae, Ch.; Van der Plas, A.
The Namibian Ministry of Fisheries and Marine Resources has the task of collecting and providing relevant oceanographic information for management of their fisheries. However, quality information is difficult to provide because of the complexity of the processes involved in the Namibian marine ecosystem. Nonetheless, there are oceanographic data available that can contribute to fisheries management by improving the general understanding of important oceanographic processes related to fisheries. The focus of this paper is on the development of simple environmental indices that can serve as a measurement or proxy of the state or intensity of certain important oceanographic processes or variables for temporal comparison. These indices relate to oceanographic...
Tipo: Journal Contribution
Palavras-chave: Fisheries management; Marine resources; Oceanographic data; Chlorophylls; Upwelling; Spatial variations; Sardine fisheries; Water temperature; El Nino phenomena; Ecosystems; Fish stocks; Surface temperature; Oxygen; Phytoplankton; Biomass; Seasonal variations; Fronts; Perturbations; Commercial fisheries; Catchability; Remote sensing; Chlorophylls; Dissolved oxygen; Environmental impact.
Ano: 2007
URL: http://hdl.handle.net/1834/4971

Monitoreo anual de la pesquería del cobo (eustrombus gigas) en Caibarién, cayería norte de Villa Clara en el 2011.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Formoso, M.; González, B.
Se presentan los resultados de monitoreo de las poblaciones comerciales de cobo en  el área comprendida entre los cayos El Cabezo y Boca de Sagua  (220  49`N--230 04`N y los 790   35W—800  07´ `W), plataforma Norte de la Provincia de Villa Clara.  A partir de los resultados de las  densidades de individuos como índice de la abundancia y la estructura poblacional encontrada, se  propone un potencial de captura de 104 TM  (peso entero).  Además, se definen las medidas de  manejo para el uso sostenible del recurso Eustrombus gigas en esta zona. El  aprovechamiento en  carne desembarcada (Eviscerada y sin manto) para individuos adultos con talla comercial se  obtiene por un factor de 0,074 (7,4%) del peso entero, que representa 7,7 TM.  Se excluye el área...
Tipo: Preprint
Palavras-chave: Monitoring; Fisheries management; Fisheries.
Ano: 2011
URL: http://hdl.handle.net/1834/4195

Indicators as a Basis for Robust and Acceptable Fisheries Management
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Nielsen, J.R.; Degnbol, P.; Reeves, S.; Hovgaard, H.
Fisheries management is an activity that is implemented to achieve some objectives for fisheries as well as society. These objectives are not always clearly stated, but will generally emphasise the sustainability of the fish stocks, in some cases supplemented with insurance of food security and an economic basis for coastal communities.
Tipo: Conference Material
Palavras-chave: Fisheries management.
Ano: 2001
URL: http://hdl.handle.net/1834/426

Social Science Methods for the Knowfish Project: An Addendum to Annex IV: The Technical Annex
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Wilson, D.C.
The purpose of this manuscript is to expand on the social science aspects of the Technical Annex of the KNOWFISH Project so that we can build a common idea of the sorts of problems we are addressing and how we can use the research methods available to us.
Tipo: Working Paper
Palavras-chave: Fisheries management; Social sciences; Http://aims.fao.org/aos/agrovoc/c_36390.
Ano: 2002
URL: http://hdl.handle.net/1834/623

Guide méthodologique de la cogestion locale des pêcheries
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Naohiko, Watanuki.
Au Sénégal, la gestion des pêcheries initiée par le gouvernement a échoué parce que les pêcheurs se sont presque tous retenus de participer au système directif de gestion, le ‘‘topdown’’, dans lequel les décisions leur sont imposées par l’autorité administrative centrale. C’est bien cette situation qui a conduit au déclin des ressources halieutiques. En revanche, les résultats semblent positifs dans des villages comme Kayar, Bamboung et Nianing où les pêcheurs prennent des initiatives de reconstitution de leurs pêcheries. Cette tendance nous conforte dans notre conviction qu’au Sénégal, en matière de gestion des pêcheries artisanales, la réussite est essentiellement construite sur l’autonomie des pêcheurs, la reconnaissance de leurs initiatives et le...
Tipo: Working Paper
Palavras-chave: Artisanal fishing; Fisheries management; Fishery policy; Fishermen.
Ano: 2007
URL: http://hdl.handle.net/1834/4305

Contribution de la recherche à l'amélioration des moyens d'existence durables des communautés de pêche artisanale: étude de cas du Sénégal
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Moustapha, Déme; Ibrahima, Seck; Diébel, Sarr; Moustapha, Thiam; Karim, Dahou; Mamadou Diop, Thioune; Aliou, Sall.
Jusqu'à une période récente, le choix et l'exécution des thèmes de recherche se faisaient sans aucune concertation ni coordination avec l'administration, les professionnels et les ONG. Le processus actuel tient davantage compte de l'ensemble des acteurs de la pêche, mais si les professionnels sont consultés lors de l'élaboration de mesures, leur participation se réduit souvent à une simple validation, sans qu'ils puissent intervenir dans l'exécution proprement dite. Ce projet vise à mieux rendre compte des capacités et programmes de recherche du point de vue des politiques nationales relatives à la pêche. Le rapport suivant synthétise quatre notes sur les conditions de vie des groupes évoluant dans la pêche artisanale, la fourniture de services de...
Tipo: Book
Palavras-chave: Fishery research; Funding; Artisanal fishing; Trade; Fisheries management; Cephalopod fisheries.
Ano: 2002
URL: http://hdl.handle.net/1834/4581

Fisheries Management Science Programme.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Beddington, J.
The Fisheries Management Science Programme (FMSP), is one of ten Renewable Natural Resources Research Programmes funded by the UK Department for International Development (DFID). The objective of DFID’s research strategy is to generate new knowledge and to promote its uptake and application such that the livelihoods of poor people are improved through better management of renewable natural resources. Within the FMSP, the programme purpose is to generate benefits for poor people by the application of new knowledge to fisheries management systems. There are two outputs, relating to capture and enhancement fisheries, within each of which both the marine and inland environments are covered. East Africa (Kenya and Tanzania) is the geographic focus for the...
Tipo: Report
Palavras-chave: Fisheries management.
Ano: 2002
URL: http://hdl.handle.net/1834/747

Pesca recreativa en jardines de la reina, Cuba:  caracterización y percepción sobre el estado   de conservación del área.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Figueredo Martín, T.; Pina Amargós, F.; Angulo Valdés, J.; Gómez Fernández, R.
La pesca recreativa es una variedad turística practicada alrededor del mundo, siendo cada vez más preferida la  captura y liberación. Pocos estudios han sido realizados sobre las pesquerías recreativas en Cuba y ninguno  enfocado a las características socio-económicas de la misma.  Los objetivos del presente trabajo son (1)  caracterizar socioeconómicamente las pesquerías recreativas en Jardines de la Reina y (2) evaluar la percepción  de los visitantes sobre la conservación de los recursos naturales del área. Para ello fueron encuestados 93  pescadores recreativos procedentes de 13 países, fundamentalmente de Reina Unido, Canadá, Argentina y  Estados Unidos. La muestra fue dominada por hombres, con edades entre 41 y 50 años, casados y graduados...
Tipo: Journal Contribution
Palavras-chave: Conservation (fishery products); Catch/effort; Socioeconomic aspects; Conservation; Fisheries management.
Ano: 2010
URL: http://hdl.handle.net/1834/4532

¿Cómo y por qué se evalúa y administra un recurso pesquero?
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Olaechea-Juárez, A.
En forma didáctica y muy ilustrada se explica el tema, recorriendo los aspectos más relevantes, se destaca el papel de la  investigación en la administración de cualquier recurso.
Tipo: Journal Contribution
Palavras-chave: Fishery resources; Fisheries management.
Ano: 1976
URL: http://hdl.handle.net/1834/4606

Evaluation des ressources et aménagement des pêcheries de la ZEE Mauritaniennes
Provedor de dados: Ocean Docs: e-repository of  publications
Tipo: Proceedings Paper
Palavras-chave: Fisheries resources; Stock assessment; Fisheries management; Artisanal fishing; Industrial fish.
Ano: 2010
URL: http://hdl.handle.net/1834/4664

Monitoreo de la pesquería de cobo  (Strombus gigas) en Nuevitas, cayería norte de Camagüey, año 2013.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Formoso, M.; Lee, I.
Se presentan los resultados del monitoreo  realizado  al área comprendida entre  la  Bahía de Nuevitas y Carabela  (210  20`N--210  50`N y los 770  10 W—770  26`W), en la plataforma  Norte de la Provincia de Camagüey. Esta localidad ha sido objeto de explotación por  la EPI de  Camagüey (EPICAM) desde el año 2000. A partir de los resultados del monitoreo y la abundancia  poblacional encontrada, se propone ratificar un potencial de captura de 103 TM/año  (peso entero),   como suele reportarse en Cuba, que equivale a unas 7,6 TM de carne sin procesar eviscerada y  sin manto, a desembarcar por la flota escamera local.   Se excluye la zona comprendida entre el  Faro de Maternillo y Cayo Sabinal, por declararse Reserva Ecológica, desde el 2009. Se proponen  las...
Tipo: Preprint
Palavras-chave: Monitoring; Capture fisheries; Fisheries management.
Ano: 2013
URL: http://hdl.handle.net/1834/5377

Etats des lieux nationaux - Projet CEPIA: dynamiques halieutiques et systèmes de gestion des pêches
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Projet CEPIA, Construire Ensemble une gestion des Pêches Intégrant les Amp, Dakar (Sénégal); Centre de Recherches Océanographiques de Dakar Thiaroye, Dakar (Sénégal); Djiga Thiaw; Moustapha Déme; Hamed Diaw Diadhiou; Adama Mbaye.
Commission Sous Régionale des Pêches
Tipo: Report
Palavras-chave: Fisheries management; Fishery legislation; Ecosystems; Demersal fisheries; Fishery policy; Protected areas.
Ano: 2011
URL: http://hdl.handle.net/1834/4585

The knowledge base for fisheries management in developing countries - alternative approaches and methods
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Degnbol, P.
Tipo: Report
Palavras-chave: Fisheries management; Developing countries.
Ano: 2001
URL: http://hdl.handle.net/1834/802

Net economic impacts of achieving maximum economic yield in fisheries
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Norman-Lopez,   Ana; Pascoe,   Sean.
Improving the economic performance of fisheries is becoming increasingly important in fisheries management, and in some cases, maximum economic yield (MEY) is set as a key management target. However, associated with MEY is a level of fishing activity that is lower than would otherwise occur, even in fisheries managed to achieve the maximum sustainable yield. This will result in losses in economic activity elsewhere in the economy, potentially resulting in a net loss to society in the short to medium term. In this paper, an input-output framework is used to estimate the net economic impact of achieving MEY in Australian fisheries. While incomes are reduced in other sectors of the economy, the net impact of achieving MEY in fisheries is dependent on how...
Tipo: Conference Paper or Presentation
Palavras-chave: Maximum economic yield; Fisheries management; Net economic impact; Input-output analysis; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/59108

Economic valuation of recreational fishing in Western Australia
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Raguragavan,   Jananee; Hailu,   Atakelty; Burton,   Michael P.
Allocation of fish resource is a controversial subject. Decision making is partly made difficult by the lack of knowledge on recreational fishing preferences and the value of fishing opportunities. This study investigates fishing site choices in Western Australia. Recreational fishing data covering the eight major fishing regions and fourty eight fishing sites in the State are used. The data are used to estimate a random utility model (RUM) of site choice behaviour with a supporting negative binomial econometric model of angler and fish-specific expected catch rates. We provide value estimates for different fish types, fishing site attribute changes as well as site access values. It is argued that sound economic value estimates can be starkly different...
Tipo: Working or Discussion Paper
Palavras-chave: Non-market valuation; Recreational fishing; Random utility models; Fisheries management; Marine environment management; Environmental Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/97473

Marine Protected Areas in Fisheries Management
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Greenville,   Jared W.; MacAulay,   T. Gordon.
The use of protected areas as a fishery management tool has been suggested as a hedge against management failures and variation in harvests. A stochastic bioeconomic model of a two-species fishery will be used to test the performance of protected areas as a management tool in a fishery with heterogenous environments. Protected areas are analysed under density-dependent and sink-source dispersal relationships between environments within the fishery. The model is applied to Manning Bioregion in NSW. Protected area performance as a tool for fisheries will be analysed given the existing management arrangement. The focus of the study is placed on the biological and economic characteristics that yield benefits to the fishery.
Tipo: Conference Paper or Presentation
Palavras-chave: Fisheries; Fisheries management; Bioeconomics; Marine protected areas; Resource /Energy Economics and Policy; Q2; Q22; Q28; Q57.
Ano: 2006
URL: http://purl.umn.edu/25532

Integration of biological, economic and sociological knowledge by Bayesian belief networks: the interdisciplinary evaluation of potential Baltic salmon management plan
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Levontin,   Polina; Kulmala,   Soile; Haapasaari,   Paivi; Kuikka,   Sakari.
There is a growing need to evaluate fisheries management plans in a comprehensive interdisciplinary context involving stakeholders. In this paper we demonstrate a probabilistic management model to evaluate potential management plans for Baltic salmon fisheries. The analysis is based on several studies carried out by scientists from respective disciplines. The main part consisted of biological and ecological stock assessment with integrated economic analysis of the commercial fisheries. Recreational fisheries were evaluated separately. Finally, a sociological study was conducted aimed at understanding stakeholder perspectives and potential commitment to alternative management plans. In order to synthesize the findings from these disparate studies a Bayesian...
Tipo: Conference Paper or Presentation
Palavras-chave: Baltic salmon; Bio-economic modelling; Bayesian Belief Network; Expert knowledge; Fisheries management; Commitment and implementation uncertainty; Management plan; Recreational fisheries; Stakeholders.; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/59093

Marine Reserves Switching under Uncertainty
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Yamazaki,   Satoshi.
This paper analyses a fisheries management strategy, marine reserves switching, in which a non-fishing area is created, removed, or rotated from one site to another according to economic criteria through time. Using a dynamic optimisation framework under uncertainty, with the different fish dispersal processes, the optimal switching strategy and density distributions of the biomass, harvest, and net profit are simulated and compared under different management scenarios. This study will provide a decision and modelling framework for the design of marine reserves to achieve desired management goals.
Tipo: Conference Paper or Presentation
Palavras-chave: Bioeconomic model; Fisheries management; Marine reserves; Uncertainty; Resource /Energy Economics and Policy; Risk and Uncertainty; Q22.
Ano: 2008
URL: http://purl.umn.edu/6003

Ignoring the Multi-species Aspect of Labor Supply Decisions in Spatially Explicit Bio-economic Fishery Models
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Stafford,   Tess.
This paper analyzes the bias associated with ignoring the multi-species aspect of labor supply decisions in spatially explicit bioeconomic fishery models.  Recent advancements have been made to simultaneously model the biology of a marine species and the strategic behavior of harvesters over both time and space in order to more accurately predict the effect of regulatory policies on harvester effort and resource population.  These models assume a nested choice structure in which the harvester first faces a dichotomous decision between fishing for the target species or not on a given day and then chooses a location to fish conditional on participation.  This structure implicitly groups all non-target species options together in the first nest forcing...
Tipo: Article
Palavras-chave: Multi-species fisheries; Labor supply; Fisheries management; Environmental Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2012
URL: http://purl.umn.edu/124367

Protected areas in fisheries: a two-patch, two-species model
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Greenville,   Jared W.; MacAulay,   T. Gordon.
The use of marine protected areas as a fishery management tool has been suggested as a hedge against management failures and variation in harvests. A stochastic bioeconomic model of a hypothetical predator–prey fishery is used to test the performance of protected areas in a fishery with heterogenous environments. Protected areas are analysed under density-dependent and sink-source dispersal relationships between the subpopulations that occur within the fishery. Differing management structures governing resource extraction are analysed. The focus of the study is placed on the biological and management characteristics that yield benefits to both fishers and society. It is shown that the establishment of a protected area improves fishery rent and lowers...
Tipo: Journal Article
Palavras-chave: Bioeconomics; Fisheries management; Marine protected areas; Resource /Energy Economics and Policy.
Ano: 2006
URL: http://purl.umn.edu/116924

An Optimization Model for the Banana Northern Prawn Fishery
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Valle de Souza,   Simone; Gondro,   Cedric; Cacho,   Oscar J.
This study presents an optimal control model of the Banana Northern Prawn Fishery, one of the most important fisheries in Australia. The life cycle of this species involves migration between the sea, where the catch takes place, and the estuary, where post-larvae and juveniles develop. The model combines a stage-matrix population dynamics model and an economic model of sustainable catch. The controls involve the amount of effort allowed and the length of the fishing season. Life stages are defined in terms of prawn size, allowing catch revenue to be adjusted to the expected proportion of specific sized classes caught in a particular month of the year, hence providing a more realistic projection of profits when price is influenced by size. The model is...
Tipo: Conference Paper or Presentation
Palavras-chave: Fisheries management; Australia; Optimal control; Profit maximisation; Banana prawns.; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/59173

Bioeconomic analysis of protected area use in fisheries management
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Greenville,   Jared W.; MacAulay,   T. Gordon.
Protected areas in fishery management have been suggested to hedge management failures and variation in harvests. In this paper, a stochastic bioeconomic model of a two-species fishery in the Manning Bioregion is used to test the performance of protected areas as a management tool in a fishery. The establishment of a protected area is analysed under the assumption of heterogenous environments that are linked via density-dependent or sink-source stock dispersal relationships. The sensitivity of the results to different degrees of management is also explored. The model is applied to the Ocean Prawn Trawl, and Ocean Trap and Line fisheries within Manning Bioregion in New South Wales, Australia. The focus of the study is placed on the biological and...
Tipo: Article
Palavras-chave: Bioeconomics; Fisheries management; Marine protected areas; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/118521

Modelling an ITQ Scheme in the Galapagos Marine Reserve Spiny Lobster Fishery
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Alvear,   Santiago A. Bermeo.
This paper assesses the distributional and economic impacts resulting from a hypothetical individual quota management system in the Galápagos spiny lobster fishery. Using data from the Fisheries Monitoring Programme, an implicit function is derived and evaluated at a total allowable catch to estimate an equilibrium price for quota. By comparing this with each vessel-owner's implicit quota price, the number of fishers who will have an economic incentive to sell quota is estimated. The outcomes of the model indicate that the equity implications, as well as the economic benefits, resulting from the introduction of an ITQ system would be significant.
Tipo: Conference Paper or Presentation
Palavras-chave: Galapagos Marine Reserve; Fisheries management; Spiny lobster; ITQs; Resource /Energy Economics and Policy.
Ano: 2006
URL: http://purl.umn.edu/31973

Equilibrium management of fisheries with altruistic overlapping generations
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Ekeland,   Ivar; Karp,   Larry S.; Sumaila,   Ussif Rashid.
We imbed a classic fishery model, where the optimal policy follows a Most Rapid Approach Path to a steady state, into an overlapping generations setting. The current generation discounts future generations’ utility flows at a rate possibly different from the pure rate of time preference used to discount their own utility flows. The resulting model has non-constant discount rates, leading to time inconsistency. The unique Markov Perfect equilibrium to this model has a striking feature: provided that the current generation has some concern for the not-yet born, the equilibrium policy does not depend on the degree of that concern.
Tipo: Working Paper
Palavras-chave: Fisheries management; Sustainable development; Renewable resources; Time inconsistency; Hyperbolic discounting; Production Economics; Q01; Q22; C 61.
Ano: 2011
URL: http://purl.umn.edu/123635

Relação peso-comprimento, fator de condição do jaraqui Semaprochilodus brama (Valenciennes, 1850) e sua importância para a pesca no rio Araguaia, Brasil.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: VALÉRIO JUNIOR, J. F.; DIAS, C. R. G.; SILVA, A. P. da.
O jaraqui Semaprochilodus brama é uma importante espécie capturada comercialmente no rio Araguaia e na bacia Amazônia. Este trabalho identificou a relação peso-comprimento e fator de condição (Kn) desta espécie visando subsidiar melhores modelos de gestão. Para isso, seis expedições foram realizadas entre setembro e novembro de 2017. Um total de 105 exemplares foram capturados, medidos (32,89 ± 2,86 cm) e pesados (689,8 ±184,7 g) no rio Araguaia município de Caseara-TO. A relação peso-comprimento (W=0,0406 L2,78) e o fator de condição (K &amp;#8805;1) indicaram que o jaraqui cresce mais em comprimento de que em peso e se encontra em condições favoráveis de higidez. Neste sentido, é necessário discutir com a sociedade (poder público, pescadores, etc.) para...
Tipo: Anais e Proceedings de eventos
Palavras-chave: Pescador; Tamanho; Gestão; Administração Pesqueira; Comunidade Pesqueira; Produção Pesqueira; Recurso Pesqueiro; Jaraqui; Semaprochilodus spp; Fisheries management; Fishermen; Fishery resources.
Ano: 2019
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113870

Brazilian recreational fisheries: current status, challenges and future direction.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: FREIRE, K. M. F.; TUBINO, R. A.; MONTEIRO-NETO, C.; ANDRADE TUBINO, M. F.; BELRUSS, C. G.; TOMÁS, A. R. G.; TUTUI, S. L. S; CASTRO, P. M. G.; MARUYAMA, L. S.; CATELLA, A. C.; CREPALDI, D. V.; DANIEL, C. R. A.; MACHADO, M. L.; MENDONÇA, J. T.; MORO, P. S.; MOTTA, F. S.; RAMIRES, M.; SILVA, M. H. C.; VIEIRA, J. P.
Recreational fisheries in Brazil have increased in importance and attracted many foreign recreational fishers. The objectives of this article were to summarise the available data on Brazilian recreational fisheries, to discuss some of their features and to analyse how they are performing in different regions compared with international trends. A review of published and unpublished sources together with data from recreational fishing licences was used. The participation rate was low (0.9%). Overall, there was a high diversity of fish species, with the following species/group of species repeatedly reported: Menticirrhus spp., Centropomus spp., Cynoscion spp., and Micropogonias furnieri (marine/estuarine water), and Cichla spp., Hoplias malabaricus, and...
Tipo: Separatas
Palavras-chave: Angling; Competitive events; Sport fisheries; Tournaments.; Pesca; Sport fishing; Fisheries management; Tourism.
Ano: 2016
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1051505

Individual transferable quota contribution to environmental stewardship: a theory in need of validation
Provedor de dados: Ecology and Society
Autores: van Putten, Ingrid; CSIRO Wealth from Oceans National Research Flagship, CSIRO Marine and Atmospheric Research; Ingrid.vanputten@csiro.au; Boschetti, Fabio; CSIRO Wealth from Oceans National Research Flagship, CSIRO Marine and Atmospheric Research; fabio.Boschetti@csiro.au; Fulton, Elizabeth A.; CSIRO Wealth from Oceans National Research Flagship, CSIRO Marine and Atmospheric Research; beth.fulton@csiro.au; Smith, Anthony D. M.; CSIRO Wealth from Oceans National Research Flagship, CSIRO Marine and Atmospheric Research; tony.d.smith@csiro.au; Thebaud, Olivier; CSIRO Wealth from Oceans National Research Flagship, CSIRO Marine and Atmospheric Research; olivier.thebaud@csiro.au.
We explored the extent to which (1) individual transferable quotas (ITQs) may lead to changes in environmental stewardship and (2) environmental stewardship may in turn contribute to explain the success or otherwise of ITQs in meeting sustainability objectives. ITQs are an example of incentive-based fisheries management in which fishing rights can be privately owned and traded. ITQs are aimed at resolving the problems created by open-access fisheries. ITQs were proposed to promote economic efficiency, and there is growing empirical evidence that ITQs meet a number of economic and social fisheries management objectives. Even though improved stock status arises as a consequence of the total allowable catch levels implemented together with ITQs, the effect is...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Comanagement; Environmental ethics; Fisheries management; Fishing rights; Stewardship.
Ano: 2014

Social networks and fishers&amp;#8217; behavior: exploring the links between information flow and fishing success in the Northumberland lobster fishery
Provedor de dados: Ecology and Society
Autores: Turner, Rachel A.; Centre for Resource Management and Environmental Studies, University of the West Indies; turnerrachela@gmail.com; Polunin, Nicholas V. C.; School of Marine Science and Technology, Newcastle University, UK; n.polunin@ncl.ac.uk; Stead, Selina M.; School of Marine Science and Technology, Newcastle University, UK; selina.stead@ncl.ac.uk.
Tipo: Peer-Reviewed Reports
Palavras-chave: Fisheries management; Fishers&amp;#8217; Behavior; Fishing success; Information sharing; Lobster fisheries; Social network analysis.
Ano: 2014

Individual transferable quotas and conservation: a critical assessment
Provedor de dados: Ecology and Society
Autores: Acheson, James; University of Maine; acheson@maine.edu; Apollonio, Spencer; ; spencerapollonio@yahoo.com; Wilson, James; University of Maine; jwilson@maine.edu.
Individual transferable quotas (ITQs) have become a popular management tool for fisheries. They have been promoted in some quarters and seriously criticized in others because of their social and economic impacts. A more serious problem is that ITQs provide exclusive access to public resources presumably in return for some public benefit, namely conservation; however, in a high percentage of cases they do not conserve fish stocks. In this article, we focus on the reasons that ITQs do not conserve stocks. We point to a number of phenomena identified in the literature as affecting stocks of fish, including problems with total allowable catch (TAC), ecological hierarchy theory, r and K species, the Allee effect, scale and metapopulation structure, the need to...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Fisheries management; Individual transferable quota; ITQs; Quota management.
Ano: 2015

The capacity to adapt?: communities in a changing climate, environment, and economy on the northern Andaman coast of Thailand
Provedor de dados: Ecology and Society
Autores: Bennett, Nathan J.; Institute for Resources, Environment and Sustainability, University of British Columbia; nathan.bennett@ubc.ca; Dearden, Philip; Department of Geography, University of Victoria; pdearden@office.geog.uvic.ca; Murray, Grant; Institute for Coastal Research, Vancouver Island University; Grant.Murray@viu.ca; Kadfak, Alin; School of Global Studies, University of Gothenburg; alin.kadfak@globalstudies.gu.se.
The health and productivity of marine ecosystems, habitats, and fisheries are deteriorating on the Andaman coast of Thailand. Because of their high dependence on natural resources and proximity to the ocean, coastal communities are particularly vulnerable to climate-induced changes in the marine environment. These communities must also adapt to the impacts of management interventions and conservation initiatives, including marine protected areas, which have livelihood implications. Further, communities on the Andaman coast are also experiencing a range of new economic opportunities associated in particular with tourism and agriculture.   These complex and ongoing changes require integrated assessment of, and deliberate planning to increase, the adaptive...
Tipo: Peer-Reviewed Reports
Palavras-chave: Adaptive capacity; Alternative livelihoods; Climate change; Coastal communities; Fisheries management; Marine protected areas; Social resilience; Thailand.
Ano: 2014

Perceived Benefits of Fisheries Management Restrictions in Madagascar
Provedor de dados: Ecology and Society
Autores: McClanahan, Tim R.; Wildlife Conservation Society; tmcclanahan@wcs.org; Cinner, Joshua E.; ARC Centre of Excellence for Coral Reef Studies; joshua.cinner@jcu.edu.au; Abunge, Caroline; Wildlife Conservation Society;; Rabearisoa, Ando; Conservation International;; Mahatante, Paubert; University of Toliara;; Ramahatratra, Frederick; University of Toliara;; Andrianarivelo, Norbert; Wildlife Conservation Society;.
Perceptions of the benefits of fisheries management restrictions were evaluated in coastal Madagascar to identify restrictions that are likely to be self- and community enforced. The survey focused on 24 Malagasy fishing villages adjacent to coral reefs. Resource users' perceptions of the benefits of restrictions were generally high and widespread, but some less positive perceptions were found in three villages located near marine protected areas. Perceptions of the benefits of gear restrictions had widespread support; closed areas, seasons, and minimum sizes of fish were less common; and restrictions on species were supported infrequently. We therefore advocate a management implementation approach that uses these scales of perceived benefits and...
Tipo: Peer-Reviewed Reports
Palavras-chave: Attitudes; Fisheries management; Marine protected area planning; Poverty; Social-ecological.
Ano: 2014

Social-Ecological Scale Mismatches and the Collapse of the Sea Urchin Fishery in Maine, USA
Provedor de dados: Ecology and Society
Autores: Johnson, Teresa R.; School of Marine Sciences, University of Maine; teresa.johnson@maine.edu; Wilson, James A.; School of Marine Sciences, University of Maine; Jwilson@maine.edu; Cleaver, Caitlin; School of Marine Sciences, University of Maine; caitlin.cleaver@maine.edu; Vadas, Robert L.; School of Biology and Ecology, University of Maine; School of Marine Sciences, University of Maine; vadas@maine.edu.
Tipo: Peer-Reviewed Reports
Palavras-chave: Collective action; Co-management; Fisheries management; Kelp; Maine  USA; Ocean fisheries; Scale mismatches; Sea urchin fishery.
Ano: 2012

Who is Right to Fish? Evolving a Social Contract for Ethical Fisheries
Provedor de dados: Ecology and Society
Autores: Lam, Mimi E.; Policy and Ecosystem Restoration in Fisheries, Fisheries Centre, University of British Columbia; m.lam@fisheries.ubc.ca; Pauly, Daniel; Sea Around Us Project, Fisheries Centre, University of British Columbia; d.pauly@fisheries.ubc.ca.
Most debates on government fisheries management, focusing on dramatic fishery collapses, have skirted the ethical dimension implicit in the exploitation, for private gain, of fishery resources that are publicly owned. The privilege to fish, a conditional right often nefariously perceived as a legislated &amp;#8220;right,&amp;#8221; implies ethical responsibilities linked to marine stewardship. To date, however, granting this privilege to fish   has not been legally tethered to the fiduciary responsibilities of   businesses to their clients or governments to their citizens:    sustainable management of fisheries and conservation of living marine resources. Legal rights must be coupled with moral responsibilities if governments, private fishing enterprises,...
Tipo: Peer-Reviewed Insight
Palavras-chave: Collaborative governance; Corporate responsibility; Fisheries management; Fishing privileges; Marine stewardship; Public ownership; Subsidies; Tragedy of the commons.
Ano: 2010

Haida Marine Planning: First Nations as a Partner in Marine Conservation
Provedor de dados: Ecology and Society
Autores: Jones, Russ; Haida Fisheries Program; russ.jones@haidanation.net; Rigg, Catherine; Haida Fisheries Program;; Lee, Lynn; School of Resource and Environmental Management, Simon Fraser University ;.
The Haida Nation is involved in an integrated marine planning initiative in northern British Columbia, Canada. The Haida continue to occupy traditional territory in and around Haida Gwaii, or the Queen Charlotte Islands, and are engaged in a larger planning process for the Pacific North Coast Integrated Management Area (PNCIMA). This initiative is in the early planning stage, focused on capacity building and creating enabling conditions for co-governance. Court decisions, government policies, and a modern treaty process are driving short- and long-term efforts to resolve issues of Aboriginal ownership and resource access, both on land and in the ocean. As a result, the PNCIMA process is being led by two levels of government, First Nations and federal,...
Tipo: Peer-Reviewed article
Palavras-chave: Aboriginal rights; Fisheries management; Indigenous peoples; Integrated coastal management; Marine planning; Oceans governance.
Ano: 2010

Considering Other Consumers: Fisheries, Predators, and Atlantic Herring in the Gulf of Maine
Provedor de dados: Ecology and Society
Autores: Read, Andrew J; Duke University; aread@duke.edu; Brownstein, Carrie R; Duke University; cbrownstein@audubon.org.
After decades of overexploitation and severe depletion, Atlantic herring stocks in waters of the northeastern United States have recovered. Fishery managers now consider the herring resource to be underexploited. Nevertheless, some fishery managers and sustainable fishery advocates in New England have expressed concern that the fishery management plan may not adequately consider the importance of herring as prey for marine mammals, seabirds, and piscivorous fish. Several studies suggest that consumption by these predators is significant, yet trophic interactions are not explicitly considered in stock assessment models. Instead, as in most fisheries stock assessments, predation is subsumed within the natural mortality rate, and no empirical estimates of...
Tipo: Peer-Reviewed Reports
Palavras-chave: Atlantic herring; Ecosystem management; Fisheries management; Gulf of Maine; Marine mammals; Piscivores; Protected species; Single-species approach; Stock assessment; Trophic interactions.
Ano: 2003

Fishful Thinking: Rhetoric, Reality, and the Sea Before Us
Provedor de dados: Ecology and Society
Autores: Pitcher, Tony J.; Policy and Ecosystem Restoration in Fisheries, Fisheries Centre, University of British Columbia.; pitcher.t@gmail.com; Lam, Mimi E; Policy and Ecosystem Restoration in Fisheries, Fisheries Centre, University of British Columbia.; m.lam@fisheries.ubc.ca.
Fisheries science and management have been shrouded in controversy and rhetoric for over 125 yrs. Human reliance on fish through history (and even prehistory) has impacted the sea and its resources. Global impacts are manifest today in threatened food security and vulnerable marine ecosystems. Growing consumer demand and subsidized industrial fisheries exacerbate ecosystem degradation, climate change, global inequities, and local poverty. Ten commonly advocated fisheries management solutions, if implemented alone, cannot remedy a history of intense fishing and serial stock depletions. Fisheries policy strategies evaluated along five performance modalities (ecological, economic, social, ethical, and institutional) suggest that composite management...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Back-to-the-future; Ecological ethics; Ecosystem restoration; Fisheries management; Fishing down the food web; Food security; Policy goals; The sea ahead; Trade-offs.
Ano: 2010

The Social Construction of Fishing, 1949
Provedor de dados: Ecology and Society
Autores: Finley, Carmel; Department of History, Oregon State University; carmel.finley@oregonstate.edu.
The theoretical construction known as maximum sustained yield (MSY) exists in three realms: as science, as policy, and as a legal concept. Despite substantial criticism by scientists and economists, MSY remains at the heart of fisheries science and fisheries management. This paper suggests that its institutional resilience springs more from its policy and legal roles than from its scientific strength. Maximum sustained yield was adopted as the goal of American fisheries policy in 1949. Between 1949 and 1955, the State Department pushed for its adoption internationally. In this paper, I first look briefly at the relationship between fishing and foreign policy goals during this period. Second, I look at how fishing was understood during 1949, when the...
Tipo: Peer-Reviewed article
Palavras-chave: Fisheries history; Fisheries management; Milner B. Schaefer; Salmon; Surplus production theory; Wilbert M. Chapman; William C. Herrington.
Ano: 2009

What does stakeholder involvement mean for fisheries management?
Provedor de dados: Ecology and Society
Autores: Bloomfield, Helen J.; University of Liverpool; H.J.Bloomfield@liverpool.ac.uk.
Tipo: Peer-Reviewed Reports
Palavras-chave: Fisheries management; Stakeholder involvement; Stakeholder preferences.
Ano: 2014

Merits and Limits of Ecosystem Protection for Conserving Wild Salmon in a Northern Coastal British Columbia River
Provedor de dados: Ecology and Society
Autores: Hill, Aaron C.; Watershed Watch Salmon Society; Flathead Lake Biological Station, University of Montana; hillfish@telus.net; Bansak, Thomas S.; Flathead Lake Biological Station, University of Montana; tom.bansak@umontana.edu; Ellis, Bonnie K.; Flathead Lake Biological Station, University of Montana; bonnie.ellis@umontana.edu; Stanford, Jack A.; Flathead Lake Biological Station, University of Montana; jack.stanford@umontana.edu.
Tipo: Peer-Reviewed Reports
Palavras-chave: Conservation; Ecology; Fisheries management; Habitat; Kitlope River; Pacific salmon; Resilience; Salmon stronghold.
Ano: 2010