Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean

Captura asociada a la pesquería de palangre de superficie dirigida a pez espada

Detalles Bibliográficos
Autores: Fernandez-Carvalho, Joana, Coelho, Rui, Cortés, Enric, Mejuto-García, Jaime, Domingo, Andrés, Yokawa, Kotaro, García-Cortés, Blanca, Forselledo, Rodrigo, Ohshimo, Seiji, Ramos-Cartelle, Ana, Santos, Miguel Neves
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/322177
Acceso en línea:http://hdl.handle.net/10261/322177
Access Level:acceso abierto
Palabra clave:Pesquerías
Centro Oceanográfico de A Coruña
Alopias superciliosus
bigeye thresher
Size distribution
Reproduction
Atlantic Ocean
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spelling Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic oceanFernandez-Carvalho, JoanaCoelho, RuiCortés, EnricMejuto-García, JaimeDomingo, AndrésYokawa, KotaroGarcía-Cortés, BlancaForselledo, RodrigoOhshimo, SeijiRamos-Cartelle, AnaSantos, Miguel NevesPesqueríasCentro Oceanográfico de A CoruñaAlopias superciliosusbigeye thresherSize distributionReproductionAtlantic OceanCaptura asociada a la pesquería de palangre de superficie dirigida a pez espadaThe bigeye thresher shark, Alopias supercilious is sometimes caught as bycatch in pelagic longline fisheries targeting tunas and swordfish in the Atlantic Ocean. As part of an ongoing cooperative program for fisheries and biological data collection, fishery observer data from various fishing nations and projects were compiled and analyzed. Those data sets include information on geographic location of the observations, as well as size, sex and in some cases maturity stage. A total of 4371 bigeye threshers were recorded throughout the Atlantic Ocean between 1992 and 2013, with the sizes ranging from 70 to 305 cm FL (fork length). Considerable variability was observed in the catchat- size, with particular emphasis on the tropical region where the mean sizes tended to be smaller than in the other regions. The expected distribution of juvenile and adult specimens also showed considerable variability, and the sex-ratios varied between regions and size classes. Maturity ogives were fitted to data from 642 specimens, with the median sizes at maturity estimated at 208.6 cm FL (corresponding to 349.1 cm TL) for females and 159.2 cm FL (corresponding to 269.8 cm TL) for males. In addition, a segmented regression model (SRM) was used for males, and two breakpoints (Bk1: 122.5cm FL, Bk2: 173.3cm FL) estimated, identifying transitions between the three different maturity stages for male sharks (immature, maturing and mature). Only a few pregnant females were recorded, always with the presence of two embryos (one per uterus), and were distributed predominantly in the tropical northeast Atlantic closer the African continent, and in the southwest region, with those regions possibly serving as nursery areas for this species. These reproductive parameters, and especially the estimated median sizes at maturity and low fecundity, highlight the vulnerability of this species, reinforcing that the bigeye thresher tends to mature at a larger size than the other species of the Alopiidae family. The biological and distributional patterns presented can help managers adopt more informed and efficient conservation measures for this species.NO202320232015info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/322177reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de A Coruñainfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3221772026-05-22T06:33:51Z
dc.title.none.fl_str_mv Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
title Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
spellingShingle Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
Fernandez-Carvalho, Joana
Pesquerías
Centro Oceanográfico de A Coruña
Alopias superciliosus
bigeye thresher
Size distribution
Reproduction
Atlantic Ocean
title_short Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
title_full Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
title_fullStr Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
title_full_unstemmed Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
title_sort Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
dc.creator.none.fl_str_mv Fernandez-Carvalho, Joana
Coelho, Rui
Cortés, Enric
Mejuto-García, Jaime
Domingo, Andrés
Yokawa, Kotaro
García-Cortés, Blanca
Forselledo, Rodrigo
Ohshimo, Seiji
Ramos-Cartelle, Ana
Santos, Miguel Neves
author Fernandez-Carvalho, Joana
author_facet Fernandez-Carvalho, Joana
Coelho, Rui
Cortés, Enric
Mejuto-García, Jaime
Domingo, Andrés
Yokawa, Kotaro
García-Cortés, Blanca
Forselledo, Rodrigo
Ohshimo, Seiji
Ramos-Cartelle, Ana
Santos, Miguel Neves
author_role author
author2 Coelho, Rui
Cortés, Enric
Mejuto-García, Jaime
Domingo, Andrés
Yokawa, Kotaro
García-Cortés, Blanca
Forselledo, Rodrigo
Ohshimo, Seiji
Ramos-Cartelle, Ana
Santos, Miguel Neves
author2_role author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Pesquerías
Centro Oceanográfico de A Coruña
Alopias superciliosus
bigeye thresher
Size distribution
Reproduction
Atlantic Ocean
topic Pesquerías
Centro Oceanográfico de A Coruña
Alopias superciliosus
bigeye thresher
Size distribution
Reproduction
Atlantic Ocean
description Captura asociada a la pesquería de palangre de superficie dirigida a pez espada
publishDate 2015
dc.date.none.fl_str_mv 2015
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/322177
url http://hdl.handle.net/10261/322177
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de A Coruña
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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