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Comparing Atlantic and Mediterranean populations of the velvet belly lanternshark, Etmopterus spinax, with comments on the efficiency of density-dependent compensatory mechanisms

2010Journal article Restricted access
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dc.contributor.authorCoelho, Rui
dc.contributor.authorRey, J.
dc.contributor.authorde Sola, L. G.
dc.contributor.authorde Carvalho, J. F.
dc.contributor.authorErzini, Karim
dc.date.accessioned2016-12-14T16:22:23Z
dc.date.available2016-12-14T16:22:23Z
dc.date.issued2010
dc.description.abstractEtmopterus spinax is a small-sized deep-water lantern shark that occurs in the Eastern Atlantic and the Mediterranean. Differences in depth distribution, densities, size at maturity and fecundity were compared between a population that has suffered high levels of fishing mortality during the last decades (Southern Portugal in the northeast Atlantic) and a population where low fishing pressure below 500 m occurs at present or has occurred in the last decades (Northern Alboran Sea in the western Mediterranean). The density of this species, as derived by experimental bottom trawl survey, off the coast of Southern Portugal, is substantially lower than in the Northern Alboran Sea throughout the entire depth range. The Atlantic population is maturing at smaller sizes than the Mediterranean population and has a lower mean fecundity. Specifically, sizes at maturity for Southern Portugal and the Northern Alboran Sea were, respectively, 25.39 and 28.31 cm TL for males and 30.86 and 34.18 cm TL for females, while mean fecundities for Southern Portugal and the Northern Alboran Sea were, respectively, 9.94 and 11.06 oocytes per mature female. This work demonstrated the possible presence of density-dependent mechanisms in the Southern Portuguese population of E. spinax that has lowered the size at maturity as a possible result of excessive fishing mortality. However, given that this is an aplacentary viviparous shark, where fecundity is dependent on female size, this compensatory mechanism seems to have a limited efficiency.
dc.identifier.doi10.1080/17451000903300885
dc.identifier.issn1745-1000
dc.identifier.otherAUT: KER00543;
dc.identifier.urihttp://hdl.handle.net/10400.1/8778
dc.language.isoeng
dc.peerreviewedyes
dc.publisherTaylor & Francis
dc.relation.isbasedonWOS:000278007900005
dc.titleComparing Atlantic and Mediterranean populations of the velvet belly lanternshark, Etmopterus spinax, with comments on the efficiency of density-dependent compensatory mechanisms
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage380
oaire.citation.issue4
oaire.citation.startPage373
oaire.citation.titleMarine Biology Research
oaire.citation.volume6
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.latestForDiscoverye20f0e2d-3085-4c37-9e98-260dc9faddea

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