Abstract
. Significant differences were found in allelic frequency distribution among three strains of rainbow trout, Oncorhynchus mykiss(Walbaum). The isocitrate dehydrogenase (IDH-3, 4* 1.1.1.42) locus was fixed in two of the strains while the superoxide dismutase (SOD-I* 1.15.1.1) locus was absent in one of the strains. Similarity indices ranged from 0·973 to 0·988 on the scale of 1·000 among pairwise comparisons of the strains while Nei's genetic distance was 0·012 between Mount Lassen and Manx, 0·025 between Mount Lassen and Tagwerker and 0·027 between Manx and Tagwerker. Gene diversity was highest in the Mount Lassen strain, followed by Manx, with Tagwerker having the least. These differences in gene diversity were attributed to breeding and management practices used at the hatchery. The need for characterization of strains of rainbow trout, especially in crossbreeding programmes that aim to increase genetic variation, was emphasized by these results.
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