Electrophoretic variation of 12 enzyme systems, representing 26 loci in four strains of domesticated rainbow trout (Salmo gairdneri Richardson) were studied. The variances among and within strains, estimated from observed frequencies, were compared to data of other studies of biochemical polymorphism carried out in this species. These preliminary results show that a large proportion of the variability in rainbow trout is present in the French hatchery stocks studied and that isolation of these groups for several generations has not caused a significant genetic differentiation as compared to all the domesticated strains studied.
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René Guyomard (1981) studied this question.
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