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dc.contributor.authorMuncaster, S.
dc.contributor.authorAndersson, Eva
dc.contributor.authorKjesbu, Olav Sigurd
dc.contributor.authorTaranger, Geir Lasse
dc.contributor.authorSkiftesvik, Anne Berit
dc.contributor.authorNorberg, Birgitta
dc.date.accessioned2010-11-09T10:01:20Z
dc.date.available2010-11-09T10:01:20Z
dc.date.issued2010-08
dc.identifier.citationJournal of Fish Biology, 77 (3), 2010: 494-511en_US
dc.identifier.issn0022-1112
dc.identifier.issn1095-8649
dc.identifier.urihttp://hdl.handle.net/11250/117047
dc.descriptionArticle published in Journal of fish biology, 77 (3): 494-511 AUG 2010en_US
dc.description.abstractThis 2 year study examined the reproductive cycle of wild female Ballan wrasse Labrus bergylta in western Norway as a precursor to captive breeding trials. Light microscopy of ovarian histology was used to stage gonad maturity and enzyme-linked immuno-absorbent assay (ELISA) to measure plasma concentrations of the sex steroids testosterone (T) and 17β-oestradiol (E2). Ovarian recrudescence began in late autumn to early winter with the growth of previtellogenic oocytes and the formation of cortical alveoli. Vitellogenic oocytes developed from January to June and ovaries containing postovulatory follicles (POF) were present between May and June. These POF occurred simultaneously among other late maturity stage oocytes. Plasma steroid concentration and organo-somatic indices increased over winter and spring. Maximal (mean ±s.e.) values of plasma T (0·95 ± 0·26 ng ml−1), E2 (1·75 ± 0·43 ng ml−1) and gonado-somatic index (IG; 10·71 ± 0·81) occurred in April and May and decreased greatly in July when only postspawned fish with atretic ovaries occurred. Evidence indicates that L. bergylta are group-synchronous multiple spawners with spawning occurring in spring and peaking in May. A short resting period may occur between late summer and autumn when previtellogenic oocytes predominate and steroid levels are minimal.en_US
dc.language.isoengen_US
dc.publisherBlackwellen_US
dc.subjectreproduksjonen_US
dc.subjectreproductionen_US
dc.subjectberggylten_US
dc.subjectballan wrasseen_US
dc.titleThe reproductive cycle of female Ballan wrasse Labrus bergylta in high latitude, temperate watersen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921en_US
dc.source.pagenumber18 s.en_US
dc.identifier.doihttp://dx.doi.org/10.1111/j.1095-8649.2010.02691.x


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