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| Registros recuperados: 295 | |
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| Paterson, Barbara; Marine Research Institute (Ma-Re), Zoology Department, University of Cape Town, South Africa; Barbara@paterson.alt.na; Kirchner, Carola; National Marine Information and Research Centre (NatMirc), Ministry of Fisheries and Marine Resources, Namibia; University of Cape Town, Graduate School of Business, South Africa; carola.kirchner32@gmail.com; Ommer, Rosemary E.; University of Victoria; ommer@uvic.ca. |
| As a legacy of Namibia’s colonial past, the country inherited severely depleted fish resources at the time of independence. Today, Namibia’s fisheries are almost exclusively industrial. The hake fishery is the country’s most important fishery, which was restructured from a pre-independence foreign fishery into one that is characterized by locally based, vertically integrated fishing and processing companies. It is widely believed that Namibia has successfully combined the neoliberal economics that have been characteristic of the development narratives since the 1980s with welfarist goals for poverty reduction. However, there are strong indications that the fish stocks are declining, while the high economic expectations for the... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Distant water fleets; Fisheries; Hake; Merlucius capensis; Merluccius paradoxus; Namibia; Namibianisation; Northern Benguela; South West Africa; Sustainable fisheries development. |
| Ano: 2013 |
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| O'Higgins, Tim; Scottish Association for Marine Science; Tim.O'Higgins@sams.ac.uk; Farmer, Andrew; Institute for European Environmental Policy; AFarmer@ieep.eu; Daskalov, Georgi; IBER-BAS;; Knudsen, Stale; University in Bergen; stale.knudsen@sosantr.uib.no; Mee, Laurence; Scottish Association for Marine Science; laurence.mee@sams.ac.uk. |
| The Black Sea has suffered severe environmental degradation. Governance of the Black Sea region is complex and results in a series of scale mismatches which constrain management. This paper develops a simple classification of spatial scale mismatches incorporating the driver, pressure, state, welfare, response (DPSWR) framework. The scale mismatch classification is applied to two major environmental problems of the Black Sea, eutrophication and small pelagic fisheries. A number of scale mismatches are described and classified and potential solutions are identified. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Black Sea; Ecosystem approach; Eutrophication; Fisheries; Marine strategy framework directive; Scale mismatch. |
| Ano: 2014 |
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| Grafton, R. Quentin. |
| This Research Report responds to the challenge for marine capture fisheries of how and when to adapt to climate change. The report presents: (1) a set of fisheries climate change policy options (2) a risk and vulnerability assessment tool and management decision-making framework; and (3) ex ante and ex post climate adaptation possibilities in the marine environment. The report also includes: (1) a discussion of how management objectives and instruments influence resilience and adaptation; (2) a decision-making process to assess vulnerabilities to climate change and to manage adaptation responses; (3) an inter-temporal framework to help decision-makers know when to adapt; (4) a risk and simulation approach to confront the uncertainties of the possible... |
| Tipo: Report |
Palavras-chave: Climate adaptation; Climate change; Fisheries; Environmental Economics and Policy. |
| Ano: 2009 |
URL: http://purl.umn.edu/94886 |
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| Kramer, Daniel B; Michigan State University; dbk@msu.edu. |
| The utility of traditional bio-economic harvest models suffers from their dependence on two commonly used approaches. First, optimization is often assumed for harvester behavior despite system complexity and the often neglected costs associated with information gathering and deliberation. Second, ecosystem interactions are infrequently modeled despite a growing awareness that these interactions are important. This paper develops a simulation model to examine the consequences of harvesting at two trophic levels in a coral-reef food web. The model assumes adaptive rather than optimizing behavior among fishermen. The consequences of changing economic, biological, and social parameters are examined using resilience as an evaluative framework. Three general... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Fisheries; Resource economics; Coral reefs; Resilience; Adaptive behavior; Food web; Simulation. |
| Ano: 2008 |
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| Njock, J.C.; Njifonjou, O.. |
| The marine fisheries production from African coastal countries, combined with that of freshwater production of the continent is estimated to be 6 millions metric tons, corresponding only 5 % of the total world production. Africa's contribution to fisheries products (1,5 %) is insignificant compared to that of world commerce which is around 44 millions tons. This deplorable situation is due to a certain number of problems which include s among others, the relative biogenic poverty of African waters, the exploitation of African waters by foreign vessels, the total lack of catches effected by the African vessels out of their regional boundaries, the lack of knowledge on the mastering of commercialisation and on veritable commercial politics of fisheries... |
| Tipo: Proceedings Paper |
Palavras-chave: Fisheries. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/839 |
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| Dortel, Emmanuelle; Sardenne, Fany; Bousquet, N.; Rivot, Etienne; Million, Julien; Le Croizier, Gael; Chassot, Emmanuel. |
| The Indian Ocean Tuna Tagging Program provided a unique opportunity to collect demographic data on the key commercially targeted tropical tuna species in the Indian Ocean. In this paper, we focused on estimating growth rates for one of these species, yellowfin (Thunnus albacares). Whilst most growth studies only draw on one data source, in this study we use a range of data sources: individual growth rates derived from yellowfin that were tagged and recaptured, direct age estimates obtained through otolith readings, and length-frequency data collected from the purse seine fishery between 2000 and 2010. To combine these data sources, we used an integrated Bayesian model that allowed us to account for the process and measurement errors associated with each... |
| Tipo: Text |
Palavras-chave: Indian Ocean yellowfin; Hierarchical Bayesian model; Tagging; Fisheries. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00254/36513/35080.pdf |
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| Berck, Peter; Perloff, Jeffrey M.. |
| How potential entrants to an open-access fishery form their expectations determines the fishery’s adjustment path to a steady state but not the steady state values themselves. It is well known that, in the standard model with myopic expectations (those based on current values), boats enter the fishery only when the fish stock is greater than its steady state stock. We show that, with rational expectations (perfect foresight), however, boats may enter when the fish stock is much lower than its steady state value if the boat fleet is sufficiently small. This paper contrasts myopic and rational expectations within a general dynamic model of an open-access fishery. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Economic aspects; Expectations; Fisheries. |
| Ano: 1982 |
URL: http://purl.umn.edu/42856 |
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| HALPIN,PATRICIA M.; STRUB,P. TED; PETERSON,WILLIAM T.; BAUMGARTNER,TIM R.. |
| Physical processes, biotic processes and human activities all act to shape marine ecosystems. Future management of these valuable ecosystems requires an integrative approach that takes into account complicated organismal interactions, oceanographic processes that span large scales of time and space, and how anthropogenic effects interact with the natural environment. The temperate west coasts of North and South America represent a unique opportunity for comparison, as many of the same oceanographic processes, particularly upwelling, occur off both coasts. Additionally, a number of marine ecosystems in both areas have surprising parallels. Here we present an overview of the oceanographic processes that dominate the coastlines, and give examples of... |
| Tipo: Journal article |
Palavras-chave: Eastern boundary currents; Anthropogenic effects; Marine community ecology; Fisheries; Interdecadal variability. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300002 |
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| Bebars, Mi; Lasserre, G; Hoai, Tl. |
| Annually exploited communities from the Nile delta and two nearby lagoons (Manzalah and Edkou) were monitored from 1962 to 1989. The changes in community structure were analysed as a function of two events: fishing pressure growth (motorized fishing vessels) which increased by a factor of 19 between 1952 and 1962; and the construction of the Aswan Dam, which was built between 1965 and 1969, reducing the flow of the Nile by 90 %. Before the construction of the dam, increased sea fishing pressure led to a decline in landings from 33,832 tons in 1962 to 8,522 tons in 1969, but with no structural change in the exploited community. However, following completion of the dam in 1969, the community structure changed and a significant correlation was detected... |
| Tipo: Text |
Palavras-chave: Impact; Aswan Dam; Yield; Fisheries; Diversity; Lagoon. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20406/18073.pdf |
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| Arnason, Ragnar. |
| Aquaculture, or more generally fish farming, and fisheries interact in several different ways. First, many types of fish farming require fish products as inputs, mostly for feeding purposes. Second, farmed fish and wild fish products compete in fish markets with consequences for both the industry and, of course, consumers. Third, fish farming generates various types of polluting agents that may affect wild fish stocks and their habitat. Several other interactions exist. This paper is primarily concerned with the implications of the first of these interactions, namely the input relationships, for the overall supply of fish products in the future. To the extent that the fish farming industry demands wild fish products such as fish meal, fish oil, etc.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Aquaculture; Fisheries; Aquaculture and fisheries interactions; Global supply of fish; Livestock Production/Industries; Q0; Q1; Q2. |
| Ano: 2005 |
URL: http://purl.umn.edu/55996 |
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| Newell, Richard G.; Papps, Kerry L.; Sanchirico, James N.. |
| We investigate the applicability of the present-value asset pricing model to fishing quota markets by applying instrumental variable panel data estimation techniques to 15 years of market transactions from New Zealand's individual fishing quota market. In addition to the influence of current fishing rents (as measured by lease prices), we explore the effect of market interest rates, risk, and expected changes in future rents on quota asset prices. Controlling for these other factors, the results support a fairly simple relationship between quota asset and contemporaneous lease prices. Consistent with theoretical expectations, the results indicate that quota asset prices are positively related to declines in interest rates, lower levels of risk, expected... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Tradable permits; Individual transferable fishing quota; Asset pricing; Fisheries; Policy; Resource /Energy Economics and Policy; Q22; Q28; D40; L10. |
| Ano: 2005 |
URL: http://purl.umn.edu/10639 |
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| Registros recuperados: 295 | |
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