A Genetic Analysis of Hatching Time in Steelhead Trout (Salmo gairdneri)

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Abstract
The elapsed time from fertilization through hatching for steelhead trout (Salmo gairdneri) was obtained from groups of eggs that were fertilized according to a factorial breeding plan in which 24 males were each mated to each of 10 females. Data were obtained from the eggs of 240 crosses held in an incubator through hatching and from replicated crosses held in an incubator for most of the incubation period, then in troughs. Estimated heritabilities for hatching time were 0 and 0.23, respectively, for these data, the differences being of additive genetic origin. Because of a significant genotype–environment interaction, it was suggested that hatching may have been controlled by different genetic mechanisms in the two environments.

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