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dc.contributor.authorSkjæraasen, Jon Egil
dc.contributor.authorKorsbrekke, Knut
dc.contributor.authorDingsør, Gjert Endre
dc.contributor.authorLangangen, Øystein
dc.contributor.authorOpdal, Anders Frugård
dc.contributor.authorJørgensen, Christian
dc.date.accessioned2021-05-10T12:47:44Z
dc.date.available2021-05-10T12:47:44Z
dc.date.created2020-07-24T15:14:41Z
dc.date.issued2020-10
dc.PublishedFisheries Research. 2020, 230 .
dc.identifier.issn0165-7836
dc.identifier.urihttps://hdl.handle.net/11250/2754705
dc.description.abstractAlthough the phenomenon of skipped spawning has been described in numerous fishes, time-series are scarce. We used the presence of post-ovulatory follicles in histological gonad slides from females not developing oocytes for Northeast Arctic (NEA) haddock Melanogrammus aeglefinus from 2009 to 2012 to construct a length-based statistical model giving the probability that a non - developing female was skipping spawning, as opposed to not being sexually mature. This model was then applied on demographic winter survey data from the Barents Sea from 1989 to 2014. This indicated large annual variation in skipping numbers. Comparing these survey estimates to the total annual ICES stock numbers, we found that skipping peaked in the years 1994–1996 and 2009–2014, when the median yearly estimate of skipped spawners was 20–45 % of all females aged ≥ 3 years. In contrast, only ∼ 3 % of females at age ≥ 3 years skipped spawning in 2007. The proportional representation of skipped spawners at the stock level appeared linked to stock energy reserves with more skipping occurring when energy levels were low. Skipping also became more frequent with increasing population age, i.e. when immatures were less abundant, although the very largest/oldest fish tended to spawn. Because the proportion of NEA haddock that skips spawning is variable and can be high, understanding variation in this phenomenon and its drivers may improve population dynamic models.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleLarge annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinusen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2020 The Authorsen_US
dc.source.articlenumber105670en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.doi10.1016/j.fishres.2020.105670
dc.identifier.cristin1820460
dc.source.journalFisheries Researchen_US
dc.source.40230
dc.source.pagenumber1-8en_US
dc.relation.projectEC/H2020/675997en_US
dc.relation.projectNærings- og fiskeridepartementet: 83710en_US
dc.relation.projectNærings- og fiskeridepartementet: 14408en_US
dc.identifier.citationFisheries Research. 2020, 230, 105670en_US
dc.source.volume230en_US


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal