Gonadal steroid fluctuations and reproduction results of European grayling (Thymallus thymallus L.) from broodstock farmed in a recirculation aquaculture system

•Gonadal steroids concentration did change in European grayling during the examined all reproductive stages.•Relative working fecundity of two-year-old females was 15 % higher than three-year-old.•In both of experimental age groups, very low levels of embryo survival to the eyed-egg stage were noted...

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Bibliographic Details
Published in:Animal reproduction science 2021-01, Vol.224, p.106648-106648, Article 106648
Main Authors: Szmyt, Mariusz, Piech, Przemysław, Panasiewicz, Grzegorz, Niewiadomski, Piotr, Pietrzak-Fiećko, Renata
Format: Article
Language:English
Subjects:
European grayling farmed broodstock
RAS
Reproduction
Sex steroids
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Summary:•Gonadal steroids concentration did change in European grayling during the examined all reproductive stages.•Relative working fecundity of two-year-old females was 15 % higher than three-year-old.•In both of experimental age groups, very low levels of embryo survival to the eyed-egg stage were noted. The initial experiment of this study was conducted to determine whether sex steroid concentrations varied before, during and after the reproductive season of European grayling (Thymallus thymallus L.) farmed broodstock confined in a recirculation aquaculture system (RAS). The results indicated that the plasma sex steroid (testosterone - T, progesterone - P4 and estradiol - E2) concentrations varied (P 
ISSN:0378-4320
1873-2232
DOI:10.1016/j.anireprosci.2020.106648