The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery?
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10437/1109 |
Resumo: | A discrete time, multi-gear, and age structured bio-economic model is developed for the East Atlantic bluefin tuna fisheries, a paradigmatic example of the difficulties faced in managing highly migratory fish stocks. The model is used to analyse alternative management strategies for the Regional Fisheries Management Organisation (RFMO) managing this fishery, and to investigate some of the policy implications. For the various scenarios, the optimal stock level varies between 500–800,000 tonnes, which compares with a stock level of 150,000 tonnes in 1995. In other words, there is a very strong case for rebuilding the stock. Moreover, the sustainability of the stock is threatened unless a recovery programme is implemented; indeed, the alternative may be stock collapse. Second, to rebuild the stock, Draconian measures are called for: either outright moratoria over fairly lengthy periods, or possibly a more gradual approach to steady state given by a Total Allowable Catch (TAC) at a low level for an extended period of time. Third, the cost of inefficient gear structure is very high indeed. |
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The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery?ECONOMIC MODELMODELOS ECONÓMICOSGESTÃO DE RECURSOS PESQUEIROSGESTÃOOTIMIZAÇÃOFISHERIES RESOURCES MANAGEMENTMANAGEMENTOPTIMIZATIONA discrete time, multi-gear, and age structured bio-economic model is developed for the East Atlantic bluefin tuna fisheries, a paradigmatic example of the difficulties faced in managing highly migratory fish stocks. The model is used to analyse alternative management strategies for the Regional Fisheries Management Organisation (RFMO) managing this fishery, and to investigate some of the policy implications. For the various scenarios, the optimal stock level varies between 500–800,000 tonnes, which compares with a stock level of 150,000 tonnes in 1995. In other words, there is a very strong case for rebuilding the stock. Moreover, the sustainability of the stock is threatened unless a recovery programme is implemented; indeed, the alternative may be stock collapse. Second, to rebuild the stock, Draconian measures are called for: either outright moratoria over fairly lengthy periods, or possibly a more gradual approach to steady state given by a Total Allowable Catch (TAC) at a low level for an extended period of time. Third, the cost of inefficient gear structure is very high indeed.The University of Chicago Press2011-04-13T10:35:44Z2006-01-01T00:00:00Z2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10437/1109eng0738-1360Brasão, AnaBjorndal, Trondinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-09T14:04:46Zoai:recil.ensinolusofona.pt:10437/1109Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:12:42.057947Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? |
title |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? |
spellingShingle |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? Brasão, Ana ECONOMIC MODEL MODELOS ECONÓMICOS GESTÃO DE RECURSOS PESQUEIROS GESTÃO OTIMIZAÇÃO FISHERIES RESOURCES MANAGEMENT MANAGEMENT OPTIMIZATION |
title_short |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? |
title_full |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? |
title_fullStr |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? |
title_full_unstemmed |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? |
title_sort |
The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery? |
author |
Brasão, Ana |
author_facet |
Brasão, Ana Bjorndal, Trond |
author_role |
author |
author2 |
Bjorndal, Trond |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Brasão, Ana Bjorndal, Trond |
dc.subject.por.fl_str_mv |
ECONOMIC MODEL MODELOS ECONÓMICOS GESTÃO DE RECURSOS PESQUEIROS GESTÃO OTIMIZAÇÃO FISHERIES RESOURCES MANAGEMENT MANAGEMENT OPTIMIZATION |
topic |
ECONOMIC MODEL MODELOS ECONÓMICOS GESTÃO DE RECURSOS PESQUEIROS GESTÃO OTIMIZAÇÃO FISHERIES RESOURCES MANAGEMENT MANAGEMENT OPTIMIZATION |
description |
A discrete time, multi-gear, and age structured bio-economic model is developed for the East Atlantic bluefin tuna fisheries, a paradigmatic example of the difficulties faced in managing highly migratory fish stocks. The model is used to analyse alternative management strategies for the Regional Fisheries Management Organisation (RFMO) managing this fishery, and to investigate some of the policy implications. For the various scenarios, the optimal stock level varies between 500–800,000 tonnes, which compares with a stock level of 150,000 tonnes in 1995. In other words, there is a very strong case for rebuilding the stock. Moreover, the sustainability of the stock is threatened unless a recovery programme is implemented; indeed, the alternative may be stock collapse. Second, to rebuild the stock, Draconian measures are called for: either outright moratoria over fairly lengthy periods, or possibly a more gradual approach to steady state given by a Total Allowable Catch (TAC) at a low level for an extended period of time. Third, the cost of inefficient gear structure is very high indeed. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-01-01T00:00:00Z 2006 2011-04-13T10:35:44Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10437/1109 |
url |
http://hdl.handle.net/10437/1109 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0738-1360 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
The University of Chicago Press |
publisher.none.fl_str_mv |
The University of Chicago Press |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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