Timecourse of oocyte development in saithe Pollachius virens
dc.contributor.author | Skjæraasen, Jon Egil | |
dc.contributor.author | Devine, Jennifer Ann | |
dc.contributor.author | Godiksen, Jane Aanestad | |
dc.contributor.author | Fonn, Merete | |
dc.contributor.author | Otterå, Håkon Magne | |
dc.contributor.author | Kjesbu, Olav Sigurd | |
dc.contributor.author | Norberg, Birgitta | |
dc.contributor.author | Langangen, Øystein | |
dc.contributor.author | Karlsen, Ørjan | |
dc.date.accessioned | 2018-01-18T11:52:16Z | |
dc.date.available | 2018-01-18T11:52:16Z | |
dc.date.created | 2016-12-21T10:49:17Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Journal of Fish Biology. 2017, 90 (1), 109-128. | nb_NO |
dc.identifier.issn | 0022-1112 | |
dc.identifier.uri | http://hdl.handle.net/11250/2478132 | |
dc.description.abstract | Wild 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.iso | eng | nb_NO |
dc.title | Timecourse of oocyte development in saithe Pollachius virens | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | acceptedVersion | nb_NO |
dc.source.pagenumber | 109-128 | nb_NO |
dc.source.volume | 90 | nb_NO |
dc.source.journal | Journal of Fish Biology | nb_NO |
dc.source.issue | 1 | nb_NO |
dc.identifier.doi | 10.1111/jfb.13161 | |
dc.identifier.cristin | 1416033 | |
dc.relation.project | Norges forskningsråd: 179569 | nb_NO |
cristin.unitcode | 7431,11,0,0 | |
cristin.unitcode | 7431,4,1,0 | |
cristin.unitcode | 7431,16,0,0 | |
cristin.unitcode | 7431,24,0,0 | |
cristin.unitname | Bunnfisk | |
cristin.unitname | Stasjon Bergen | |
cristin.unitname | Fiskeridynamikk | |
cristin.unitname | Reproduksjon og utvikl.biologi | |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 |
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