Seasonal prevalence and intensity of follicular atresia in Baltic cod Gadus morhua callarias L

Gerd Kraus, Jonna Tomkiewicz, R. Diekmann, Fritz Köster

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In the present study, 307 ovaries of eastern Baltic cod Gadus morhua callarias sampled during the prespawning and spawning season 2000 were analysed histologically to estimate the seasonal prevalence and intensity of atresia. The number of atretic oocytes per ovary was estimated using a combination of the physical disector method and volume fraction (Delesse principle). Atretic oocytes were observed in 32% of the ovaries. Prevalence of atresia was independent of female size, but increased significantly with declining female condition from prespawning and through the spawning stages. The relative intensity of atresia, i.e. number of atretic oocytes in relation to normally developed vitellogenic oocytes, was low amounting to 1.4% on average. Similar to prevalence, relative intensity of atresia differed significantly between maturity stages and increased with decreasing female condition. The population egg loss due to atresia amounted to 4.6% indicating that Baltic cod was performing close to maximum productivity, i.e. potential egg production. (c) 2008 The Authors Journal compilation (c) 2008 The Fisheries Society of the British Isles.
Original languageEnglish
JournalJournal of Fish Biology
Volume72
Issue number4
Pages (from-to)831-847
ISSN0022-1112
DOIs
Publication statusPublished - 2008

Fingerprint

Dive into the research topics of 'Seasonal prevalence and intensity of follicular atresia in Baltic cod Gadus morhua callarias L'. Together they form a unique fingerprint.

Cite this