Egg mortality of northeast Arctic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus)

<qd> Langangen, Ø., Stige, L. C., Yaragina, N. A., Vikebø, F. B., Bogstad, B., and Gusdal, Y. Egg mortality of northeast Arctic cod ( Gadus morhua ) and haddock ( Melanogrammus aeglefinus ). – ICES Journal of Marine Science, doi:10.1093/icesjms/fst007. </qd>High and variable mortality du...

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Bibliographic Details
Published in:ICES Journal of Marine Science
Main Authors: Langangen, Øystein, Stige, Leif C., Yaragina, Natalia A., Vikebø, Frode B., Bogstad, Bjarte, Gusdal, Yvonne
Format: Text
Language:English
Published: Oxford University Press 2013
Subjects:
Larval Fish Conference: Assessing the relative contribution of different sources of mortality
Arctic
Stige
Arctic cod
Gadus morhua
Northeast Arctic cod
Online Access:http://icesjms.oxfordjournals.org/cgi/content/short/fst007v1
https://doi.org/10.1093/icesjms/fst007
Description
Summary:<qd> Langangen, Ø., Stige, L. C., Yaragina, N. A., Vikebø, F. B., Bogstad, B., and Gusdal, Y. Egg mortality of northeast Arctic cod ( Gadus morhua ) and haddock ( Melanogrammus aeglefinus ). – ICES Journal of Marine Science, doi:10.1093/icesjms/fst007. </qd>High and variable mortality during the egg and larval stages is thought to be an important source of interannual variability in stock size in many marine fish. However, quantitative information about the mortality during these life stages, especially interannual variability, is sparse. Here, we used a time-series covering 35 years (1959–1993) of survey data to estimate mortality during the egg stages of northeast Arctic cod ( Gadus morhua ) and Northeast Arctic haddock ( Melanogrammus aeglefinus ). Using a regression approach based on the numbers of eggs in different developmental stages, we calculated the mean instantaneous mortality rate of cod eggs to be 0.17 d−1 (95% CI: 0.15–0.19), which is significantly higher than that for haddock, 0.09 d−1 (95% CI: 0.07–0.12). Interannual variability in egg mortality ranges from ∼0.12 to ∼0.22 d−1 for cod and from ∼0.04 to ∼0.12 d−1 for haddock. The accuracy of these estimates was evaluated by the analysis of synthetic data constructed from a coupled physical–biological model, suggesting that mean mortality and the magnitude of interannual variability were estimated reliably, but not mortality for any given year.

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