Behavioural variation in juvenile Arctic charr in relation to body size
Abstract:Young Arctic charr Salvelinus alpinus, derived from one male and one female only from Lake Ölvesvatn in northern Iceland (a stock that has been popular in Icelandic aquaculture), showed large variance in body size, primarily as a consequence of variable egg size. Shortly after the onset of exogenous feeding, large fish (0·11–0·14 g) were more active and fed mainly from the water surface. Small fish (0·06–0·09 g) moved less and made fewer foraging attempts. They spent most of the time on the bottom, and foraged equally on the bottom and surface. These findings can be used to improve growth and performance of juveniles in rearing tanks.
Document Type: Regular Paper
Affiliations: 1: LERMA-EA3202, Environnements marins naturels et contrôlés, Institut National des Sciences et Techniques de la Mer (CNAM), BP 324, 50103 Cherbourg cedex, France and 2: Hólar College, 551 Saudarkrókur, Iceland
Publication date: 2003-06-01