Abstract
Heritability estimates for length, weight and condition factor were obtained for a stock of Arctic charr ( Salvelinus alpinus) derived from Lake Hornavan, northern Sweden. Individually tagged fish from 30 full-sib families were studied at two locations in northern Sweden. Estimates of heritability in the narrow sense were obtained from parent-offspring regression and in the broad sense from the variance component of full sibs. Estimates from three ages show that additive genetic effects for length, weight and condition factor increase with age. A relationship was observed between age at sexual maturation and size. Mature charrs at age 2+appear to have grown faster than immature charrs. From the two fish farms included in this study, heritability estimates for size characters were in agreement. The proportion of sexually mature charrs varied significantly between the fish farms and was weakly correlated for families kept at both locations.
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