How variable is the fecundity within and between cod stocks? ...

• Main Authors: Lambert, Yvan, Kjesbu, Olav S., Kraus, Gerd, Marteinsdottir, Gudrun, Thorsen, Anders
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2005 - Q - Theme session 2024
• Subjects: Fisheries and aquaculture; Technologies and data; atlantic cod; Gadus morhua; North Atlantic
• Online Access: https://dx.doi.org/10.17895/ices.pub.25350439; https://ices-library.figshare.com/articles/conference_contribution/How_variable_is_the_fecundity_within_and_between_cod_stocks_/25350439

No abstracts are to be cited without prior reference to the author.Stock reproductive potential is determined by the number of fish at age, sex ratio, proportion of mature female at age and fecundity. Fecundity data, which are fundamental in estimating egg production are not collected routinely for most fish stocks. Thus, variability in fecundity is largely ignored in the estimations of reproductive potential. The objective of this study was to identify patterns of spatial and temporal variation in the fecundity within and between different stocks of Atlantic cod (Gadus morhua) in the North Atlantic and Baltic Sea. A review of fecundity data for cod of different stocks and years was made. The examination of fecundity at size indicated a very large variability in the fecundity of cod between stocks and years. The fecundity of a 60 cm cod varied from 210 000 eggs to 2 250 000 eggs. Baltic and North Sea cod stocks were very distinct from the others, highest fecundity-at-size notwithstanding years being observed ...