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An overview of the hooking mortality of elasmobranchs caught in a swordfish pelagic longline fishery in the Atlantic Ocean

2012-11-21Journal article Open Access
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dc.contributor.authorCoelho, Rui
dc.contributor.authorFernandez-Carvalho, Joana
dc.contributor.authorLino, Pedro
dc.contributor.authorSantos, Miguel N.
dc.date.accessioned2015-11-17T12:19:44Z
dc.date.available2015-11-17T12:19:44Z
dc.date.issued2012-11-21
dc.description.abstractHooking (or “at-haulback”) fishing mortality was analysed in elasmobranchs captured by Portuguese longliners targeting swordfish in the Atlantic Ocean. Information was collected by on-board fishery observers who monitored 834 longline fishing sets between August 2008 and December 2011, and recorded information on 36,067 elasmobranch specimens from 21 different taxa. The hooking mortality proportions were species-specific, with some species having relatively high percentages of live specimens at time of haulback (e.g., blue shark, crocodile shark, pelagic stingray, manta, devil and eagle rays), while others had higher percentages of dead specimens (e.g., smooth hammerhead, silky shark, bigeye thresher). For the most captured species, logistic GLMs were carried out to compare the mortality rates between sexes, specimen sizes and the regions of operation of the fleet. The sex-specific proportions of hooking mortality were significantly different for blue and crocodile sharks, with the males of both species having higher proportions of hooking mortality than the females. Specimen size was significant for predicting the hooking mortality for blue and shortfin mako sharks: in both cases, the larger specimens had lower odds of dying due to the fishing process. There were differences in the hooking mortality depending on the region of operation of the fleet, but those differences were also species-specific. For blue and crocodile sharks, the hooking mortality was higher in the Equatorial and southern Atlantic areas (when compared to the NE Atlantic region), while the opposite was observed for the shortfin mako, with lower mortality rates in the NE tropical area compared with the other regions. The results presented in this paper can be integrated into future ecological risk assessment analysis for pelagic elasmobranchs. Furthermore, the new information can be used to evaluate the impact of recent recommendations prohibiting the retention of some vulnerable elasmobranch species.pt_PT
dc.identifier.doi10.1051/alr/2012030pt_PT
dc.identifier.issn0990-7440
dc.identifier.otherAUT: RMS01092;
dc.identifier.urihttp://hdl.handle.net/10400.1/7060
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectHooking mortalitypt_PT
dc.subjectPelagic longline fisheriespt_PT
dc.subjectBycatchpt_PT
dc.subjectDiscardspt_PT
dc.subjectSharkspt_PT
dc.subjectRayspt_PT
dc.subjectAtlantic Oceanpt_PT
dc.titleAn overview of the hooking mortality of elasmobranchs caught in a swordfish pelagic longline fishery in the Atlantic Oceanpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FMAR%2F109915%2F2009/PT
oaire.citation.endPage319pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage311pt_PT
oaire.citation.titleAquatic Living Resourcespt_PT
oaire.citation.volume25pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameCoelho
person.familyNameLino
person.givenNameRui
person.givenNamePedro
person.identifier134638
person.identifier849968
person.identifier.ciencia-idDC1A-20B7-EAC0
person.identifier.ciencia-id3616-498C-1963
person.identifier.orcid0000-0003-3813-5157
person.identifier.orcid0000-0002-0214-6172
person.identifier.ridC-1163-2008
person.identifier.ridB-6065-2008
person.identifier.scopus-author-id56257111100
person.identifier.scopus-author-id6701691255
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.isAuthorOfPublication5ccbc5f5-78c6-4443-b86f-dfdd573c9f9e
relation.isAuthorOfPublication.latestForDiscovery5ccbc5f5-78c6-4443-b86f-dfdd573c9f9e
relation.isProjectOfPublication646a664d-f899-4d80-a138-3023563d04c6
relation.isProjectOfPublication.latestForDiscovery646a664d-f899-4d80-a138-3023563d04c6

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