Age and growth of shortfin mako in the South Atlantic

Detalhes bibliográficos
Autor(a) principal: Rosa, Daniela
Data de Publicação: 2018
Outros Autores: Mas, Federico, Mathers, Alyssa, Natanson, Lisa J., Carlson, John, Coelho, Rui
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: http://hdl.handle.net/10400.1/12615
Resumo: The shortfin mako, Isurus oxyrinchus (Lamnidae), is regularly caught as by-catch in pelagic longline fisheries and is among the most vulnerable sharks to this fishery. The age and growth of I. oxyrinchus was studied along a wide South Atlantic region. Data from 332 specimens ranging in size from 90 to 330 cm fork length (FL) for females and 81 to 250 cm FL for males were analysed. Growth models were fitted using the von Bertalanffy growth equation re-parameterised to calculate L0, instead of t0, and a modification of this equation using the known size at birth. The von Bertalanffy growth equation with fixed L0 (size at birth = 63 cm FL) with resulting growth parameters of Linf = 218.5 cm FL, k = 0.170 year-1 for males and Linf = 263.1 cm FL, k = 0.112 year-1 for females, seemed to underestimate maximum length for this species, while overestimating k. Given the poorly estimated parameters we cannot, to this point, recommend the use of the South Atlantic growth curves.
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spelling Age and growth of shortfin mako in the South AtlanticAge and growthIsurus oxyrinchusLife history parametersShortfin makoThe shortfin mako, Isurus oxyrinchus (Lamnidae), is regularly caught as by-catch in pelagic longline fisheries and is among the most vulnerable sharks to this fishery. The age and growth of I. oxyrinchus was studied along a wide South Atlantic region. Data from 332 specimens ranging in size from 90 to 330 cm fork length (FL) for females and 81 to 250 cm FL for males were analysed. Growth models were fitted using the von Bertalanffy growth equation re-parameterised to calculate L0, instead of t0, and a modification of this equation using the known size at birth. The von Bertalanffy growth equation with fixed L0 (size at birth = 63 cm FL) with resulting growth parameters of Linf = 218.5 cm FL, k = 0.170 year-1 for males and Linf = 263.1 cm FL, k = 0.112 year-1 for females, seemed to underestimate maximum length for this species, while overestimating k. Given the poorly estimated parameters we cannot, to this point, recommend the use of the South Atlantic growth curves.ICCATSapientiaRosa, DanielaMas, FedericoMathers, AlyssaNatanson, Lisa J.Carlson, JohnCoelho, Rui2019-06-06T17:43:23Z20182018-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/12615eng1021-5212info:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-02-18T17:20:12Zoai:sapientia.ualg.pt:10400.1/12615Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T20:18:31.579981Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Age and growth of shortfin mako in the South Atlantic
title Age and growth of shortfin mako in the South Atlantic
spellingShingle Age and growth of shortfin mako in the South Atlantic
Rosa, Daniela
Age and growth
Isurus oxyrinchus
Life history parameters
Shortfin mako
title_short Age and growth of shortfin mako in the South Atlantic
title_full Age and growth of shortfin mako in the South Atlantic
title_fullStr Age and growth of shortfin mako in the South Atlantic
title_full_unstemmed Age and growth of shortfin mako in the South Atlantic
title_sort Age and growth of shortfin mako in the South Atlantic
author Rosa, Daniela
author_facet Rosa, Daniela
Mas, Federico
Mathers, Alyssa
Natanson, Lisa J.
Carlson, John
Coelho, Rui
author_role author
author2 Mas, Federico
Mathers, Alyssa
Natanson, Lisa J.
Carlson, John
Coelho, Rui
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Sapientia
dc.contributor.author.fl_str_mv Rosa, Daniela
Mas, Federico
Mathers, Alyssa
Natanson, Lisa J.
Carlson, John
Coelho, Rui
dc.subject.por.fl_str_mv Age and growth
Isurus oxyrinchus
Life history parameters
Shortfin mako
topic Age and growth
Isurus oxyrinchus
Life history parameters
Shortfin mako
description The shortfin mako, Isurus oxyrinchus (Lamnidae), is regularly caught as by-catch in pelagic longline fisheries and is among the most vulnerable sharks to this fishery. The age and growth of I. oxyrinchus was studied along a wide South Atlantic region. Data from 332 specimens ranging in size from 90 to 330 cm fork length (FL) for females and 81 to 250 cm FL for males were analysed. Growth models were fitted using the von Bertalanffy growth equation re-parameterised to calculate L0, instead of t0, and a modification of this equation using the known size at birth. The von Bertalanffy growth equation with fixed L0 (size at birth = 63 cm FL) with resulting growth parameters of Linf = 218.5 cm FL, k = 0.170 year-1 for males and Linf = 263.1 cm FL, k = 0.112 year-1 for females, seemed to underestimate maximum length for this species, while overestimating k. Given the poorly estimated parameters we cannot, to this point, recommend the use of the South Atlantic growth curves.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-01-01T00:00:00Z
2019-06-06T17:43:23Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.1/12615
url http://hdl.handle.net/10400.1/12615
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1021-5212
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dc.publisher.none.fl_str_mv ICCAT
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dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
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instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
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reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
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