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dc.contributor.authorSkjæraasen, Jon Egil
dc.contributor.authorDevine, Jennifer Ann
dc.contributor.authorGodiksen, Jane Aanestad
dc.contributor.authorFonn, Merete
dc.contributor.authorOtterå, Håkon Magne
dc.contributor.authorKjesbu, Olav Sigurd
dc.contributor.authorNorberg, Birgitta
dc.contributor.authorLangangen, Øystein
dc.contributor.authorKarlsen, Ørjan
dc.date.accessioned2018-01-18T11:52:16Z
dc.date.available2018-01-18T11:52:16Z
dc.date.created2016-12-21T10:49:17Z
dc.date.issued2017
dc.identifier.citationJournal of Fish Biology. 2017, 90 (1), 109-128.nb_NO
dc.identifier.issn0022-1112
dc.identifier.urihttp://hdl.handle.net/11250/2478132
dc.description.abstractWild caught North Sea saithe Pollachius virens were monitored for growth, sex steroid profiles and oocyte development pre-spawning and measured for egg size and group fecundity during the spawning season in the laboratory. Vitellogenesis commenced in late October–early November, at a leading cohort size (CL) of c. 250 µm, after which oocytes grew rapidly in size until spawning started in February. Notably, a distinct cortical alveoli stage was virtually absent with yolk granules observed in developing oocytes at the very beginning of vitellogenesis. Little atresia was observed pre-spawning, but atretic re-absorption of remnant oocytes containing yolk granules was found in all females immediately post-spawning. As expected, concentrations of sex steroids, oestradiol-17β (females), testosterone (both sexes) and 11-ketotestosterone (both sexes), increased pre-spawning before dropping post-spawning. The present experiment provides the first validation of sex steroid levels in P. virens. Post-ovulatory follicles were visible in histological sections from female gonads 9–11 months post-spawning, but then disappeared. Spawning commenced around a CL of c. 750 µm (700–800 µm). Hydrated oocytes (eggs) measured between 1·04 and 1·31 mm (mean = 1·18 mm) with decreasing sizes towards the end of spawning. The average estimated realized fecundity was c. 0·84 million eggs (median female total length, LT = 60 cm). Spawning lasted from 13 February to 29 March.nb_NO
dc.language.isoengnb_NO
dc.titleTimecourse of oocyte development in saithe Pollachius virensnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber109-128nb_NO
dc.source.volume90nb_NO
dc.source.journalJournal of Fish Biologynb_NO
dc.source.issue1nb_NO
dc.identifier.doi10.1111/jfb.13161
dc.identifier.cristin1416033
dc.relation.projectNorges forskningsråd: 179569nb_NO
cristin.unitcode7431,11,0,0
cristin.unitcode7431,4,1,0
cristin.unitcode7431,16,0,0
cristin.unitcode7431,24,0,0
cristin.unitnameBunnfisk
cristin.unitnameStasjon Bergen
cristin.unitnameFiskeridynamikk
cristin.unitnameReproduksjon og utvikl.biologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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