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Effects of fishing methods on deep water shark species caught as by-catch off southern Portugal

2008Journal article Restricted access
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dc.contributor.authorCoelho, R.
dc.contributor.authorErzini, Karim
dc.date.accessioned2016-12-14T16:22:25Z
dc.date.available2016-12-14T16:22:25Z
dc.date.issued2008
dc.description.abstractDeep water sharks are commonly caught as by-catch of longlines targeting bony fishes and trawlers targeting crustaceans in deep water off the southern Portuguese coast. Due to low or no commercial value, these species are most of the times discarded at sea, with only the larger specimens of some species commercialized at very low prices. In this study we present size distributions, maturity distributions, and sex ratios of 2,138 specimens belonging to four different species, namely the lantern sharks Etmopterus pusillus and Etmopterus spinax and the catsharks Galeus melastomus and Galeus atlanticus, caught with these two gears. Trawls generally caught smaller-sized specimens, in a wider length range than longlines. Trawls caught mostly immature specimens of all species, namely 83.7% immature of E. pusillus, 84.3% of E. spinax, 89.5% of G. melastomus, and 95.5% of G. atlanticus, while longlines caught mostly immature E. pusillus (69.2%) and G. melastomus (78.6%) and mostly mature E. spinax (88.2%) and G. atlanticus (87.2%). Trawls tended to catch more males than females of all species except E. spinax, while longlines caught more females than males of E. spinax and G. melastomus and more males than females of the other two species. The main conclusion of this work is that trawls are catching smaller-sized and mostly immature specimens when compared to longlines, meaning that they are probably having a more detrimental effect on these shark populations. The data presented here have significant implications for the conservation of these shark populations since sizes, sexes, and the immature and mature components of the populations are being affected differently by these two fishing gears.
dc.identifier.doi10.1007/s10750-008-9335-y
dc.identifier.issn0018-8158
dc.identifier.otherAUT: KER00534;
dc.identifier.urihttp://hdl.handle.net/10400.1/8791
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer Verlag
dc.relation.isbasedonWOS:000254903400017
dc.subjectSize distribution
dc.subjectSex ratio
dc.subjectMaturity
dc.subjectDeep water sharks
dc.subjectFishing gears
dc.subjectBy-catch
dc.titleEffects of fishing methods on deep water shark species caught as by-catch off southern Portugal
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceUniv Coll Cork, Dept Zool, Ecol & Plant Sci, Cork, IRELAND
oaire.citation.endPage193
oaire.citation.startPage187
oaire.citation.titleHydrobiologia
oaire.citation.volume606
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
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication6366aa1b-1301-43a3-b2b0-1280311ac95f
relation.isAuthorOfPublicatione20f0e2d-3085-4c37-9e98-260dc9faddea
relation.isAuthorOfPublication.latestForDiscovery6366aa1b-1301-43a3-b2b0-1280311ac95f

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