SS1.09 Fisheries Population Linkage Spatial and Temporal Variation in Zooplankton
Date: Wednesday, June 12, 2002
Time: 2:30:00 PM
Location: Carson C
 
RinguetteM, GIROQ, Université LAVAL, Québec, Canada, marc.ringuette@giroq.ulaval.ca
Sirois, P, , Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Canada, Pascal_Sirois@uqac.ca
Fortier, M, , CEOS, University of Manitoba, Winnipeg, Canada, mfortier@Ms.UManitoba.CA
Perron, V, , GIROQ, Université LAVAL, Québec, Canada, 
Fortier, L, , GIROQ, University LAVAL, Québec, Canada,  Louis.Fortier@bio.ulaval.ca
 
TEMPERATURE EFFECT ON FEEDING, GROWTH AND SURVIVAL OF ARCTIC COD LARVAE (BOREOGADUS SAIDA) IN THE NORTH WATER POLYNYA
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Arctic cod play a central role in the Arctic food web, channeling the energy from the plankton up to the higher trophic levels. Growth and survival of fish larvae are believed to be controlled by feeding success and/or environmental factors such as temperature. We hypothesize that an earlier phytoplankton bloom triggered by oceanic and atmospheric forcing will hasten copepod egg production and prey availability to fish larvae in the Eastern region of the polynya. Stomach content and growth based on otolith were determined on 514 larvae collected between May and July 1998 (3.53 to 15.56 mm). Contrary to our hypothesis, feeding success and growth depended on SST > 0ºC, which occurred first on the Western sector of the polynya. Based on 1998 data, the spawning strategy of Arctic cod in the North Water is apparently adapted to disperse the larvae in areas where temperature increases early in the season. We conclude that Arctic Cod would benefit from a warming of the summer surface layer over the extensive Arctic shelves.