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Age and growth of the bigeye thresher shark, Alopias superciliosus, from the pelagic longline fisheries in the tropical northeastern Atlantic Ocean, determined by vertebral band counts

2011-12-01Journal article Open access
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dc.contributor.authorFernandez-Carvalho, Joana
dc.contributor.authorCoelho, Rui
dc.contributor.authorErzini, Karim
dc.contributor.authorSantos, Miguel N.
dc.date.accessioned2015-11-13T11:51:37Z
dc.date.available2015-11-13T11:51:37Z
dc.date.issued2011-12-01
dc.description.abstractThe bigeye thresher, Alopias supercilious, is commonly caught as bycatch in pelagic longline fisheries targeting swordfish. Little information is yet available on the biology of this species, however. As part of an ongoing study, observers sent aboard fishing vessels have been collecting set of information that includes samples of vertebrae, with the aim of investigating age and growth of A. supercilious. A total of 117 A. supercilious were sampled between September 2008 and October 2009 in the tropical northeastern Atlantic, with specimens ranging from 101 to 242 cm fork length (FL) (176 to 407 cm total length). The A. supercilious vertebrae were generally difficult to read, mainly because they were poorly calcified, which is typical of Lamniformes sharks. Preliminary trials were carried out to determine the most efficient band enhancement technique for this species, in which crystal violet section staining was found to be the best methodology. Estimated ages in this sample ranged from 2 to 22 years for females and 1 to 17 years for males. A version of the von Bertalanffy growth model (VBGF) re-parameterised to estimate L0, and a modified VBGF using a fixed L0 were fitted to the data. The Akaike information criterion (AIC) was used to compare these models. The VBGF produced the best results, with the following parameters: Linf = 293cm FL, k =0.06/yr and L0 = 111 cm FL for females; Linf = 206 cm FL, k = 0.18/yr and L0 = 93 cm FL for males. The estimated growth coefficients confirm that A. supercilious is a slow-growing species, highlighting its vulnerability to fishing pressure. It is therefore urgent to carry out more biological research to inform fishery managers more adequately and address conservation issues.pt_PT
dc.identifier.doihttp://dx.doi.org/10.1051/alr/2011046pt_PT
dc.identifier.issn0990-7440
dc.identifier.otherAUT: KER00534;
dc.identifier.urihttp://hdl.handle.net/10400.1/7038
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relation.publisherversionhttp://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8466896&fulltextType=RA&fileId=S0990744011000465pt_PT
dc.subjectAge and growthpt_PT
dc.subjectVertebraept_PT
dc.subjectPelagic longline fisheriespt_PT
dc.subjectBycatchpt_PT
dc.subjectSharkpt_PT
dc.subjectLamniformespt_PT
dc.subjectAlopiidaept_PT
dc.subjectNE Atlantic Oceanpt_PT
dc.titleAge and growth of the bigeye thresher shark, Alopias superciliosus, from the pelagic longline fisheries in the tropical northeastern Atlantic Ocean, determined by vertebral band countspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FMAR%2F109915%2F2009/PT
oaire.citation.endPage368pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage359pt_PT
oaire.citation.titleAquatic Living Resourcespt_PT
oaire.citation.volume24pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameCoelho
person.familyNameErzini
person.givenNameRui
person.givenNameKarim
person.identifier134638
person.identifier.ciencia-idDC1A-20B7-EAC0
person.identifier.ciencia-idD917-7133-341A
person.identifier.orcid0000-0003-3813-5157
person.identifier.orcid0000-0002-1411-0126
person.identifier.ridC-1163-2008
person.identifier.ridM-5216-2013
person.identifier.scopus-author-id56257111100
person.identifier.scopus-author-id7004015948
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication6366aa1b-1301-43a3-b2b0-1280311ac95f
relation.isAuthorOfPublicatione20f0e2d-3085-4c37-9e98-260dc9faddea
relation.isAuthorOfPublication.latestForDiscovery6366aa1b-1301-43a3-b2b0-1280311ac95f
relation.isProjectOfPublication646a664d-f899-4d80-a138-3023563d04c6
relation.isProjectOfPublication.latestForDiscovery646a664d-f899-4d80-a138-3023563d04c6

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