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Size selective mortality in plaice and cod eggs: A new approach to the study of egg-mortality?
Jaworski, A.; Rijnsdorp, A.D. (1989). Size selective mortality in plaice and cod eggs: A new approach to the study of egg-mortality? CM Documents - ICES, C.M. 1989(L:29). International Council for the Exploration of the Sea: Copenhagen. 7 + tables + figures pp.
Part of: ICES CM Documents - ICES. ICES: Copenhagen. ISSN 1015-4744

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Keywords
    Ichthyoplankton surveys; Prospecting; Surveying; Total mortality; Gadus morhua Linnaeus, 1758 [WoRMS]; Pleuronectes platessa Linnaeus, 1758 [WoRMS]; ANE, North Sea [Marine Regions]; Marine

Authors  Top 
  • Jaworski, A.
  • Rijnsdorp, A.D.

Abstract
    In this paper a new approach to the study of egg-mortality in pelagic fish eggs is proposed, which is based on the observed difference in egg-mortality between eggs of different sizes. The difference in mortality is suggested to be related to size-selective predation. This hypothesis is explored by studying changes in size of plaice (Pleuronectes platessa) and cod (Gadus morhua) eggs in plankton samples collected over the total spawning season in 1987 in the South Bight of the North Sea. Egg-size increased during incubation in both plaice and cod. The size-selective mortality estimated from the change in egg-size of plaice and cod separately, appeared to be close to the size selective mortality estimated from the difference in mortality between species.

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