Abstract
Haemolytic activity was analysed in sera from 202 rainbow trout ( Salmo gairdneri). The material consisted of 20 full-sib groups within nine paternal half-sib groups. The fish were blood-sampled and individually carlin-tagged. Repeat blood-samples were taken 2 and 8 weeks after the first sampling. An increase in the antibody-dependent haemolytic activity and decrease in the non-specific haemolytic activity, from the first to the second sampling, indicated different activation patterns associated with these responses in rainbow trout. Both the antibody-dependent and the non-specific haemolytic activity showed statistically significant variation between families. The magnitude of the estimated heritabilities ranged from medium to relatively high.
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