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Link to original content: https://pubmed.ncbi.nlm.nih.gov/27734466
Timecourse of oocyte development in saithe Pollachius virens - PubMed Skip to main page content
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. 2017 Jan;90(1):109-128.
doi: 10.1111/jfb.13161. Epub 2016 Oct 13.

Timecourse of oocyte development in saithe Pollachius virens

J E Skjaeraasen  1 , J A Devine  1 , J A Godiksen  1 , M Fonn  2 , H OtterÅ  2 , O S Kjesbu  1   3 , B Norberg  4 , Ø Langangen  3 , Ø Karlsen  1
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Timecourse of oocyte development in saithe Pollachius virens

J E Skjaeraasen et al. J Fish Biol. 2017 Jan.

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.

Keywords: atresia; egg size; fecundity; oocyte development; post-ovulatory follicles; timing of gonad maturation.

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