Abstract
Survival data obtained for offspring of 187 sires and 1404 dams of Atlantic salmon (eight year classes of data) and 213 sires and 1062 dams of rainbow trout (nine year classes) were analysed. Over year classes, average survival rates in the observation periods (during incubation and the early fresh water phase) ranged from 48% to 98%, being lowest in the period before the eyed-egg stage and during first feeding. In both species, heritabilities for survival derived from the sire components of variance were low (0.04–0.09). Heritabilities derived from the dam components of variance ranged from medium to high (0.31–0.87), indicating non-additive genetic and/or common environmental effects. Genetic correlations between survival in two succeeding periods were all, except one, positive and medium in magnitude (0.18–0.46). Genetic correlations between survival in non-succeeding periods were in general low and non-significant. Significant positive correlation between long-term survival and growth rate was found in Atlantic salmon (0.37). The corresponding correlation in rainbow trout was also positive (0.23), but not significantly different from zero.
Published Version
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