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Registros recuperados: 143
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A model for the phenotypic plasticity of North sea herring growth in relation to trophic conditions ArchiMer
Shinn, Yunne-jai; Rochet, Marie-joelle.
An adaptation of the von Bertalanffy growth model is formulated to describe the phenotypic plasticity of fish somatic growth in relation to trophic conditions. The model is developed for the North sea Downs herring (Clupea harengus). II suggests that annual growth variability during 1974-1990 was mainly due to the combined effects of herring abundance and wind-induced turbulence (coincident with the spring stratification of the water column). Springtime turbulences cause reduced and delayed planktonic blooms preceding the annual foraging period of Downs herring. The negative relation observed between herring abundance and growth is hypothesized to be due to intra-specific competition for trophic resources. Incorporated into the calculation of yield per...
Tipo: Text Palavras-chave: Modèle de croissance; Densité-dépendance; Plasticité phénotypique; Clupea harengus; Hareng de mer du Nord; Gestion des pêches; Growth model; Density dependence; Phenotypic plasticity; Fishery management; Clupea harengus; North sea herring.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00188/29878/28358.pdf
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A model to determine benefits obtainable from the management of riverine fisheries of Bangladesh AgEcon
Ahmed, Mahfuzuddin.
Tipo: Report Palavras-chave: River fisheries; Fishery management; Fishery economics; Economic models; Bangladesh; Resource /Energy Economics and Policy.
Ano: 1991 URL: http://purl.umn.edu/44726
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A model-based evaluation of Marine Protected Areas: the example of eastern Baltic cod (Gadus morhua callarias L.) ArchiMer
Kraus, Gerd; Pelletier, Dominique; Dubreuil, Julien; Moellmann, Christian; Hinrichsen, Hans-harald; Bastardie, Francois; Vermard, Youen; Mahevas, Stephanie.
The eastern Baltic cod stock collapsed as a consequence of climate-driven adverse hydrographic conditions and over fishing and has remained at historically low levels. Spatio-temporal fishing closures [Marine Protected Areas (MPAs)] have been implemented since 1995, to protect and restore the spawning stock. However, no signs of recovery have been observed yet, either suggesting that MPAs are an inappropriate management measure or pointing towards suboptimal closure design. We used the spatially explicit fishery simulation model ISIS-Fish to evaluate proposed and implemented fishery closures, combining an age-structured population module with a multifleet exploitation module and a management module in a single model environment. The model is parameterized...
Tipo: Text Palavras-chave: Stock recovery; Model; Marine Protected Areas; Fishery management; Baltic cod.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6094.pdf
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A new approach to determine the distributional effects of quota management in fisheries ArchiMer
Bellanger, Manuel; Macher, Claire; Guyader, Olivier.
Quota allocation mechanisms have distributional effects that are highly relevant to the economic organization of fisheries. In France, where fishing allocations are non-transferable, quotas are shared among Producer Organizations (POs) based on the historical landings of their members. Each PO is then responsible for implementing their own internal rules that provide individual or collective allocations to their members. This study investigates the distributional effects of the various quota management systems adopted by POs on quotas and production for the Bay of Biscay sole fishery. A comparison between initial allocations by vessel based on historical landings and actual observed landings is presented. Inequality metrics are used to quantify...
Tipo: Text Palavras-chave: Distribution; Inequality; Producer organizations; Catch shares; Common-pool resources; Fishery management.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00332/44359/43999.pdf
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Accords de pêche UE-Sénégal et commerce international Respect des réglementations internationales, gestion durable des ressources et sécurité alimentaire OceanDocs
Dahou, K.; Dème, M..
Tipo: Proceedings Paper Palavras-chave: Fishery regulations; Fishery economics; Fishery management; Food security; Sustainable management; Food safety; Http://aims.fao.org/aos/agrovoc/c_33995.
Ano: 2001 URL: http://hdl.handle.net/1834/197
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Aire marine protégée, gestion halieutique, diversification et développement local: le cas de la reserve de biosphère du Delta du Saloum (Sénégal) OceanDocs
Sarr, O..
Cette thèse étudie le problème de la gestion des pêches au sein d’une AMP, en tenant compte du système économique global ainsi que des transformations structurelles qui affectent celui ci, et en diversifiant les critères de gestion. Le cas d’étude est la RBDS (Sénégal). Une enquête de terrain montre que la population de cette localité diversifie ses activités essentiellement entre l’agriculture, la pêche et le tourisme. Une analyse économétrique indique que la démographie, la sécheresse et la baisse du prix de l’arachide sur le marché mondial sont les principales causes de la crise agricole dans la région. Cette crise favorise la diversification vers la pêche. Un modèle théorique étudiant ce processus montre qu’il conduit la pêche à l’équilibre de libre...
Tipo: Theses and Dissertations Palavras-chave: Marine environment; Fishery management; Ecology; Tourism; Socioeconomic aspects; Fishery resources; Marine environment; Fishery management; Ecology; Tourism; Fishery resources; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_7822; Http://aims.fao.org/aos/agrovoc/c_2942.
Ano: 2005 URL: http://hdl.handle.net/1834/2617
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Aménagement des ressources halieutiques au Sénégal: partenariat et démarche préventive OceanDocs
Ndiaye, O..
Le gouvernement du Sénégal s’est engagé, en élaborant le Plan directeur des pêches en 1998, à mettre en oeuvre « une politique de gestion prudentielle » de la ressource halieutique, conformément au Code de conduite pour une pêche responsable (FAO,1995). D’où l'intérêt d’examiner les contraintes à la conservation et à l’exploitation durable de la ressource et comment lever ces contraintes. La situation des pêches est caractérisée par un état critique de la ressource halieutique du fait de plusieurs facteurs, la surpêche entrant en première ligne. Plusieurs contraintes ont été identifiées. Les principales sont l’absence d'une démarche de planification dans la gestion des ressources halieutiques, le problème de l'appropriation de la réglementation, la...
Tipo: Report Palavras-chave: Fishery management; Fishing; Environmental charts; Fishery oceanography; Fishery regulations; Fishing effort; Fishery statistics; Fishery resources; Fishery management; Fishery oceanography; Fishing; Fishing effort; Fishery resources; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_2938; Http://aims.fao.org/aos/agrovoc/c_26950; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_2942.
Ano: 2000 URL: http://hdl.handle.net/1834/1524
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An evaluation of the policy of fishery resources management by TACs in European Community waters from 1983 to 1992 ArchiMer
Biais, Gerard.
In 1983, the European Community (EC) agreed on a system for the conservation and management of fishery resources whi h is based largely on the use of annual total allowable catch (TAC). Nevertheless, the state of many European stocks of demersal species has worsened since 1983. A review of TAC enforcement shows that landings have exceeded TACs to a limited estent for these resources. The contrary is observed for the stocks of pelagic species of which the state has improved although landings have frequently been larger than TACs. This double paradox generates a feeling of limited impact of the TAC system inmplemented by the EC. To investigate the reasons, the closeness between agreed TACs and scientific recommendations has been examined. The results show...
Tipo: Text Palavras-chave: Gestion des pêches; Politique des quota; Communauté Européenne; Prévisions de captures; Évaluation des débarquements; Fishery management; Quota regulations; European Community; Catch predictions; Landing statistics.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00016/12726/9649.pdf
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Análisis secuencial de la población de merluza de cola (Macruronus magellanicus)en el atlantico sudoccidental período 1985-1995. OceanDocs
Wöhler, O.C.; Giussi, A.R.; Hansen, J.E..
Sequential population analysis on Long Tail Hake (Macruronus magellanicus)from the Southwest Atlantic. Years 1985-1995. VPA on the Long Tail Hake (Macruronus magellanicus), based on data covering the years 1985 up to 1995, was performed to assess the current state of the stock. Simulation trials, inducing uncertainty about both the natural mortality rate and recruitment were also accomplished, to evaluate the risk of overfishing which is associated to different fishing alternatives, always under the assumption of a single and closed Long Tail Hake population. CPUE data were not appropriate for tunning, so the traditional VPA has been applied. During the period of study, stock biomass and spawning stock biomass showed an increased trend. Long and short-term...
Tipo: Journal Contribution Palavras-chave: Stock assessment; Fishery management; Catch/effort; Fishing mortality; Overfishing; Biomass; Sexual maturity; Stock assessment; Fishery management; Biomass; Overfishing; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_34068; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 1999 URL: http://hdl.handle.net/1834/1875
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Análisis secuencial de la población de polaca (Micromesistius australis) en el período 1987-1997 ajustado con valores de rendimiento por unidad de esfuerzo de pesqueros comerciales. OceanDocs
Wöhler, O.C.; Cordo, H.D.; Hansen, J.E.; Cassia, M.C..
The current status of southern blue whiting Micromesistius australis stock is described. A single, closed fish population is assumed to inhabit the SW Atlantic. Based on catch data corresponding to years 1987-1997, a sequential analysis on the stock is carried out (Cohort Analysis). Under an adaptative framework, catch per unit of effort data from commercial vessels are used to fit the model. Two commercial fleets are used in the fitting, i.e. Polish vessels (1987-1994)and Argentine surimi factory vessels (1991-1997). Results indicate that both, total stock biomass and spawning stock biomass would have declined. Total biomass would have decreased from a maximum close to 1.4 million tons in 1990 down to 0.5 mt in 1997 whereas the current spawning stock...
Tipo: Journal Contribution Palavras-chave: Stock assessment; Fishery management; Catch/effort; Recruitment; Biomass; Demersal fisheries; Demersal fisheries; Stock assessment; Fishery management; Biomass; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_926.
Ano: 2001 URL: http://hdl.handle.net/1834/1867
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Analyse typologique des activités de pêche de la flottille des côtes-d'Armor ArchiMer
Berthou, Patrick; Chevaillier, P; Jezequel, Michele.
Introduction: Setting up a policy of coastal fisheries management goes through a preliminary stage of understanding the dynamics of the fishing fleets as much as their tactics. Small fleets, such as those of the Côtes d'Armor, are characterised by: - the boats' home ports are scattered widely, - the heterogeneousness of the types of vessels and fishing gear used, - the versatility of the fishing units, - the plurispecificity of the exploited resource, - the flexibility of operating strategies, that is, the fishing owners' ability to change occupation. However, this flexibility is limited by the availability of the resource, by the market, by the investments granted (boats, fishing materiel), as well as by "cultural" context and know-how. This...
Tipo: Text Palavras-chave: Saint Brieux Bay; Fishery management; Typology; Fishing vessel.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/rapport-1555.pdf
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Analysis and prediction of yellowfin tuna (Thunnus albacares) catch rates of longline fisheries in the western Indian Ocean using a neural network. OceanDocs
Nishida, T.; Komatsu, T..
Strengthening tuna management is one of the primary tasks for the new Indian Ocean Tuna Commission (IOTC). Stock assessment and the prediction of the dynamics of the tuna resources will become increasingly important research topics because they provide the basic information for the management decision process. Under these circumstances, this paper attempts to develop the stock analyses and prediction techniques using neural networks. As a first step and as a test study, analyses and predictions of catch rates of the Japanese yellowfin tuna longline fisheries are attempted.
Tipo: Proceedings Paper Palavras-chave: Fishery management; Stock assessment; Catch/effort; Tuna fisheries.
Ano: 1998 URL: http://hdl.handle.net/1834/60
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Aplicación preliminar del análisis de rendimiento por recluta al efectivo pesquero de merluza común (Merluccius hubbsi) del Golfo San Matías OceanDocs
Morsan, E.M.; González, R.A..
El presente informe ha sido confeccionado con el objeto de asisitir en forma expedita a las Autoridades Provinciales en la adecuación y actualización de las pautas de manejo de la pesquería de merluza común Merluccius hubbsi que se desarrolla en la Jurisdicción Provincial (Golfo San Matías).
Tipo: Report Palavras-chave: Yield/recruit; Yield predictions; Stock assessment; Fishery management; Stock assessment; Fishery management; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_24026.
Ano: 1998 URL: http://hdl.handle.net/1834/3713
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Approaches and frameworks for management and research in small-scale fisheries in the developing world AgEcon
Andrew, Neil; Evans, Louisa.
Commonly adopted approaches to managing small-scale fisheries (SSFs) in developing countries do not ensure sustainability. Progress is impeded by a gap between innovative SSF research and slower-moving SSF management. The paper aims to bridge the gap by showing that the three primary bases of SSF management--ecosystem, stakeholders’ rights and resilience--are mutually consistent and complementary. It nominates the ecosystem approach as an appropriate starting point because it is established in national and international law and policy. Within this approach, the emerging resilience perspective and associated concepts of adaptive management and institutional learning can move management beyond traditional control and resource-use optimization, which largely...
Tipo: Working or Discussion Paper Palavras-chave: Developing countries; Fishery management; Artisanal fishing; Research and Development/Tech Change/Emerging Technologies.
Ano: 2009 URL: http://purl.umn.edu/53029
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Assessment of condition in pejerrey Odontesthes bonariensis (Atheriniformes: Atherinopsidae) populations: which index works best? Neotropical Ichthyology
Baigún,Claudio R. M.; Colautti,Darío C.; Grosman,Fabian.
The pejerrey Odontesthes bonariensis is the most important target species in temperate freshwater fisheries of Argentina, and assessment of condition has been a regular practice and common diagnostic tool. Most pejerrey fishery studies have used Fulton's (K) index, without testing whether underlying assumptions or requirements were met. We analyzed and contrasted the applicability of K, Kn and Wr indices to assess condition status in several pejerrey populations inhabiting Pampean lakes. Our results showed that whereas Wr and Kn displayed significant condition changes across length at some study lakes, Kn portrayed a small range of variation. We also noted that pejerrey maximum length and size structure strongly varied among populations probably due to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish plumpness; Pampean lakes; Fishery management.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300011
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Atelier de formation sur le code de la pêche à Kayar - 26 juillet 2002 OceanDocs
Ndiaye, O.; Sané, K.; Diouf, P.S..
Dans le but de former et de sensibiliser les acteurs chargés de I'application des lois et réglements relatifs à la pêche et ceux à qui cette réglementation s'applique, une seance de vulgarisation des lois et réglements régissant la pêche au Sénégal a été organisé le 26 juillet 2002 à Kayar
Tipo: Report Palavras-chave: Fishery management; Fishery policy; Fishery regulations; Fishery management; Http://aims.fao.org/aos/agrovoc/c_24026.
Ano: 2002 URL: http://hdl.handle.net/1834/1745
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Atelier sur la gestion et la valorisation des ressources halieutiques côtières en Afrique de l'ouest OceanDocs
Tipo: Proceedings Paper Palavras-chave: Hygiene; Rare resources; Saline water; Saproplankton; Wastes; Water resources; Fishery resources; Fishery management; Water resources; Fishery management; Wastes; Fishery resources; Hygiene; Saline water; Http://aims.fao.org/aos/agrovoc/c_8325; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_8307; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_3739; Http://aims.fao.org/aos/agrovoc/c_16376.
Ano: 2001 URL: http://hdl.handle.net/1834/1707
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Au front, bulletin d'information du projet Evaluation et Gestion des Ressources halieutiques de la République du Sénégal OceanDocs
Bulletin d'information du projet Evaluation et Gestion des Ressources Halieutiques au Sénégal
Tipo: Other Palavras-chave: Fish culture; Fish consumption; Fish; Fish conversion factors; Fish catch statistics; Fishery management; Fishery biology; Fish; Fish culture; Fishery management; Fishery biology.
Ano: 2004 URL: http://hdl.handle.net/1834/1483
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Avances en métodos y tecnología aplicados a la investigación pesquera. Seminario final del Proyecto INIDEP-JICA sobre evaluación y monitoreo de recursos pesqueros 1994-1999 OceanDocs
The Seminar organized by the Japan International Cooperation Agency (JICA) and the National Institute for Fisheries Research and Development (INIDEP) of Argentina, was held at INIDEP, Mar del Plata from September 6-9, 1999. The publication comprises expanded abstracts of each presentation, in four Theme Sessions: Reproduction and Survival, Age and Growth, Stock Identifcation and Resource Management Techniques and Relation between Oceanographic and Fishing Conditions. Presentations focused mainly on the following marine resources: squids Illex argentinus and Loligo sanpaulensis; and fish species southern blue whiting Micromesistius australis, patagonian hoki Macruronus magellanicus, kingklip Genypterus blacodes, patagonian toothfish Dissostichus...
Tipo: Book Palavras-chave: International cooperation; Research programmes; Fishery resources; Reproduction; Survival; Growth; Age determination; Fishery management; Population structure; Stock identification; Mesh selectivity; Satellite sensing.
Ano: 1999 URL: http://hdl.handle.net/1834/5510
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Beneficio económico de la caballa (Scomber japonicus) con relación a la temperatura superficial del mar en el área de Mar del Plata. OceanDocs
Perrotta, R.G.; Hernandez, D.R..
The temperature that limits the presence of schools of Argentine chub mackerel Scomber japonicus was found to be around 19°C in the Mar del Plata area Buenos Aires prov., Argentina. At higher values, most shoals leave coastal waters in direction to the mid-shelf. An inverse relationship was observed between catches per unit of effort CPUE and sea surface temperature. The highest CPUE values corresponded to temperatures lower than 19°C. Beyond that value, the possibility of obtaining a CPUE higher than the unit is nearly null and the low standard deviation means it is unlikely to reach high CPUE values. The economic profit per minute of each daily cruise was estimated using a case study carried out with a single vessel pilot with mean structural and...
Tipo: Journal Contribution Palavras-chave: Catch/effort; Surface temperature; Fishery management; Commercial fishing; Mackerel fisheries; Fishery management; Http://aims.fao.org/aos/agrovoc/c_24026.
Ano: 2002 URL: http://hdl.handle.net/1834/2543
Registros recuperados: 143
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