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dc.contributor.authorOesterwind, Danieles_ES
dc.contributor.authorBobowski, Biancaes_ES
dc.contributor.authorBrunsch, Anikaes_ES
dc.contributor.authorLaptikhovsky, Vladimir L.es_ES
dc.contributor.authorvan Hal, Ralfes_ES
dc.contributor.authorSell, Anne F.es_ES
dc.contributor.authorPierce, Graham J.es_ES
dc.date.accessioned2019-11-05T12:55:30Z-
dc.date.available2019-11-05T12:55:30Z-
dc.date.issued2020-
dc.identifier.citationFisheries Research 221: 105384 (2020)es_ES
dc.identifier.issn0165-7836-
dc.identifier.urihttp://hdl.handle.net/10261/194013-
dc.description9 pages, 5 figures, 2 tableses_ES
dc.description.abstractGlobal changes drive abundance and distribution of species worldwide. It seems that at least some cephalopod stocks profit from global changes as indicated by increases in biomass and/or expansion of their geographical distribution, as appears to be the case for the commercially important ommastrephid squid Illex coindetii, in the North Sea. Based on the recently increased abundance of this species seen in research trawl hauls, here we present the first evidence of a summer spawning stock of Illex coindetii in the North Sea and derive a description of its life cycle. Neither mated females nor spent males were reported from the area previously. In quarter 1 the majority of Illex coindetii were immature (maturity stage 0) and maturing (maturity stage 1–3) while in quarter 3 almost exclusively mature and spent individuals (maturity stage 4–6) were caught. We observed up to three spermatangia bundles attached to females in quarter 3, indicating that spawning and reproduction takes place in the North Sea and that the species is already established in this area. Estimated egg hatching dates suggest a prolonged hatching period and therefore likely a long spawning season, although cold temperature seems to limit year round reproduction. The intensity of individual migrations from adjacent waters into the North Sea is unknown and therefore the number of individuals staying permanently in the North Sea could not be estimated. It is consequently still unclear whether the North Sea individuals of I. coindetii constitute a new separate stockGlobal changes drive abundance and distribution of species worldwide. It seems that at least some cephalopod stocks profit from global changes as indicated by increases in biomass and/or expansion of their geographical distribution, as appears to be the case for the commercially important ommastrephid squid Illex coindetii, in the North Sea. Based on the recently increased abundance of this species seen in research trawl hauls, here we present the first evidence of a summer spawning stock of Illex coindetii in the North Sea and derive a description of its life cycle. Neither mated females nor spent males were reported from the area previously. In quarter 1 the majority of Illex coindetii were immature (maturity stage 0) and maturing (maturity stage 1–3) while in quarter 3 almost exclusively mature and spent individuals (maturity stage 4–6) were caught. We observed up to three spermatangia bundles attached to females in quarter 3, indicating that spawning and reproduction takes place in the North Sea and that the species is already established in this area. Estimated egg hatching dates suggest a prolonged hatching period and therefore likely a long spawning season, although cold temperature seems to limit year round reproduction. The intensity of individual migrations from adjacent waters into the North Sea is unknown and therefore the number of individuals staying permanently in the North Sea could not be estimated. It is consequently still unclear whether the North Sea individuals of I. coindetii constitute a new separate stockes_ES
dc.description.sponsorshipThanks are due to FCT/MCTES for financial support to CESAM (UID/AMB/50017/2019) through national funds and ERDF co-financing, under the Partnership Agreement for the PT2020 and Compete 2020 programs. GJP was supported by the Cephs & Cephs INTERREG project (EAPA_282/2016)es_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.isversionofPostprintes_ES
dc.rightsembargoedAccesses_ES
dc.subjectNorth Seaes_ES
dc.subjectOmmastrephidaees_ES
dc.subjectIllexes_ES
dc.subjectReproductiones_ES
dc.subjectDistributiones_ES
dc.subjectLife cyclees_ES
dc.titleFirst evidence of a new spawning stock of Illex coindetii in the North Sea (NE-Atlantic)es_ES
dc.typeartículoes_ES
dc.identifier.doihttp://dx.doi.org/10.1016/j.fishres.2019.105384-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttps://doi.org/10.1016/j.fishres.2019.105384es_ES
dc.embargo.terms2022-01-01es_ES
dc.relation.csices_ES
oprm.item.hasRevisionno ko 0 false*
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