© 2005 International Council for the Exploration of the Sea
The combined effect of transport and temperature on distribution and growth of larvae and pelagic juveniles of Arcto-Norwegian cod
a Institute of Marine Research PO Box 1870 Nordnes, N-5817 Bergen, Norway
b Department of Biology, University of Bergen PO Box 7800, N-5020 Bergen, Norway
*Correspondence to F. Vikebø: tel: +47 55238441; fax: +47 55238687. e-mail: frode.vikeboe{at}imr.no.
Temperature has been identified in field studies as the physical parameter most influential on growth and recruitment of Arcto-Norwegian cod. However, it has been pointed out by many authors that temperature in this context has not only direct effects on the cod, but also indirect effects through lower trophic levels. Moreover, it has been said that temperature might also be a proxy for other climatic parameters. The present paper analyses the direct quantitative effects of temperature on larval and pelagic juvenile growth from spawning in Lofoten until the 0-group fish settle in the Barents Sea. The approach taken is that of a modelling study, supported by analysis of existing data on fish stocks and climate. It is shown that transport and temperature alone can reproduce key features of the 0-group weight distribution and concentration in the Barents Sea for two consecutive years. The extent of the dispersion of the larvae and pelagic juveniles, as well as the ambient temperature they experience on their route, are shown to depend upon their depth in the water column and, to a lesser degree, the time of spawning.
Keywords: Arcto-Norwegian cod, growth, larvae and pelagic juveniles, ocean model, transport
Received 30 January 2005; accepted 20 May 2005.
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