Impact of swordfish fisheries on sea turtles in the Azores.

Detalhes bibliográficos
Autor(a) principal: Ferreira, Rogério L.
Data de Publicação: 2001
Outros Autores: Martins, Helen R., Silva, Alexandre A., Bolten, Alan B.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.3/156
Resumo: The surface longline fishery around the Azores targets swordfish (Xiphias gladius). Bycatch from this fishery includes loggerhead sea turtles (Caretta caretta) and occasionally leatherback sea turtles (Dermochelys coriacea) that are either hooked or entangled in the lines. Hooks are generally set at depths of 15-50 m and baited with squid, mackerel, or sometimes with shark meat. The size classes of loggerhead sea turtles caught ranged from 41.3 to 65.4 cm curved carapace length and constitutes the largest size class of loggerheads occurring in the Azores. The impact on this size class affects the survival of the southeastern United States (SEUS) population of loggerheads because the loggerheads from the Azores are primarily from SEUS rookeries. For one commercial longline boat, we observed that the mean capture of turtles per 1000 hooks by month ranged between a minimum of 0.04 in May and a maximum of 0.79 in July with a weighted mean catch of 0.27. October and November also registered high catch rates. Of 60 turtles recorded, 54 were hooked in the mouth, 3 in the esophagus, 1 in the eye, 1 in the flipper, and one was undetermined. The turtles that were caught were physically strong, except one that was weak and another dead. Total capture of loggerhead sea turtles is estimated to be 4190 for the entire fleet fishing in the Exclusive Economic Zone of the Azores during the swordfish season (May to December) of 1998. We strongly recommend that observer programs be continued because capture rates may vary among years and among fishing boats.
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spelling Impact of swordfish fisheries on sea turtles in the Azores.EspadarteSwordfishTartaruga MarinhaTurtlesAçoresAzoresThe surface longline fishery around the Azores targets swordfish (Xiphias gladius). Bycatch from this fishery includes loggerhead sea turtles (Caretta caretta) and occasionally leatherback sea turtles (Dermochelys coriacea) that are either hooked or entangled in the lines. Hooks are generally set at depths of 15-50 m and baited with squid, mackerel, or sometimes with shark meat. The size classes of loggerhead sea turtles caught ranged from 41.3 to 65.4 cm curved carapace length and constitutes the largest size class of loggerheads occurring in the Azores. The impact on this size class affects the survival of the southeastern United States (SEUS) population of loggerheads because the loggerheads from the Azores are primarily from SEUS rookeries. For one commercial longline boat, we observed that the mean capture of turtles per 1000 hooks by month ranged between a minimum of 0.04 in May and a maximum of 0.79 in July with a weighted mean catch of 0.27. October and November also registered high catch rates. Of 60 turtles recorded, 54 were hooked in the mouth, 3 in the esophagus, 1 in the eye, 1 in the flipper, and one was undetermined. The turtles that were caught were physically strong, except one that was weak and another dead. Total capture of loggerhead sea turtles is estimated to be 4190 for the entire fleet fishing in the Exclusive Economic Zone of the Azores during the swordfish season (May to December) of 1998. We strongly recommend that observer programs be continued because capture rates may vary among years and among fishing boats.Universidade dos AçoresRepositório da Universidade dos AçoresFerreira, Rogério L.Martins, Helen R.Silva, Alexandre A.Bolten, Alan B.2008-12-15T10:37:27Z20012001-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.3/156eng"ARQUIPÉLAGO. Ciências Biológicas e Marinhas". ISSN 0873-4704. Nº 18A (2001): 75-790873-4704info: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:RCAAP2022-12-20T14:27:18Zoai:repositorio.uac.pt:10400.3/156Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:23:11.088754Repositório 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 Impact of swordfish fisheries on sea turtles in the Azores.
title Impact of swordfish fisheries on sea turtles in the Azores.
spellingShingle Impact of swordfish fisheries on sea turtles in the Azores.
Ferreira, Rogério L.
Espadarte
Swordfish
Tartaruga Marinha
Turtles
Açores
Azores
title_short Impact of swordfish fisheries on sea turtles in the Azores.
title_full Impact of swordfish fisheries on sea turtles in the Azores.
title_fullStr Impact of swordfish fisheries on sea turtles in the Azores.
title_full_unstemmed Impact of swordfish fisheries on sea turtles in the Azores.
title_sort Impact of swordfish fisheries on sea turtles in the Azores.
author Ferreira, Rogério L.
author_facet Ferreira, Rogério L.
Martins, Helen R.
Silva, Alexandre A.
Bolten, Alan B.
author_role author
author2 Martins, Helen R.
Silva, Alexandre A.
Bolten, Alan B.
author2_role author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade dos Açores
dc.contributor.author.fl_str_mv Ferreira, Rogério L.
Martins, Helen R.
Silva, Alexandre A.
Bolten, Alan B.
dc.subject.por.fl_str_mv Espadarte
Swordfish
Tartaruga Marinha
Turtles
Açores
Azores
topic Espadarte
Swordfish
Tartaruga Marinha
Turtles
Açores
Azores
description The surface longline fishery around the Azores targets swordfish (Xiphias gladius). Bycatch from this fishery includes loggerhead sea turtles (Caretta caretta) and occasionally leatherback sea turtles (Dermochelys coriacea) that are either hooked or entangled in the lines. Hooks are generally set at depths of 15-50 m and baited with squid, mackerel, or sometimes with shark meat. The size classes of loggerhead sea turtles caught ranged from 41.3 to 65.4 cm curved carapace length and constitutes the largest size class of loggerheads occurring in the Azores. The impact on this size class affects the survival of the southeastern United States (SEUS) population of loggerheads because the loggerheads from the Azores are primarily from SEUS rookeries. For one commercial longline boat, we observed that the mean capture of turtles per 1000 hooks by month ranged between a minimum of 0.04 in May and a maximum of 0.79 in July with a weighted mean catch of 0.27. October and November also registered high catch rates. Of 60 turtles recorded, 54 were hooked in the mouth, 3 in the esophagus, 1 in the eye, 1 in the flipper, and one was undetermined. The turtles that were caught were physically strong, except one that was weak and another dead. Total capture of loggerhead sea turtles is estimated to be 4190 for the entire fleet fishing in the Exclusive Economic Zone of the Azores during the swordfish season (May to December) of 1998. We strongly recommend that observer programs be continued because capture rates may vary among years and among fishing boats.
publishDate 2001
dc.date.none.fl_str_mv 2001
2001-01-01T00:00:00Z
2008-12-15T10:37:27Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.3/156
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dc.language.iso.fl_str_mv eng
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dc.relation.none.fl_str_mv "ARQUIPÉLAGO. Ciências Biológicas e Marinhas". ISSN 0873-4704. Nº 18A (2001): 75-79
0873-4704
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dc.publisher.none.fl_str_mv Universidade dos Açores
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dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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