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Individual variation in competitive performance of juvenile cod and its consequences for growth

Published online by Cambridge University Press:  01 June 2000

Paul J.B. Hart  and
Anne Gro V. Salvanes
Paul J.B. Hart
Affiliation:
Department of Fisheries and Marine Biology, University of Bergen, High Technology Centre, N-5020 Bergen, Norway Department of Biology, University of Leicester, Leicester, LE1 7RH, UK. E-mail: pbh@leicester.ac.uk
Anne Gro V. Salvanes
Affiliation:
Department of Fisheries and Marine Biology, University of Bergen, High Technology Centre, N-5020 Bergen, Norway
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Abstract

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This communication reports on experiments, which studied the variation in competitive performance of juvenile cod (Gadus morhua L.) and their growth rates. The fish were held in groups of five in either summer or winter conditions and tested for their individual response to prey offered sequentially. There was marked individual variability. Fish that took the highest share of prey tended also to be those that took prey earlier than others. In winter conditions these fish were the largest, but in summer conditions size had no effect. There was a positive influence of the indices of competitive performance on individual growth rate but the relationship was not significant

Type
SHORT COMMUNICATION
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 80 , Issue 3 , June 2000 , pp. 569 - 570
Copyright
2000 Marine Biological Association of the United Kingdom