The gene consitution of an individual river population of the chum salmon was compared with that of other river populations by geneitc distance calculated from the allelic frequencies at six isozymic loci, Idh-A2, Idh-B2, Ldh-A1, Mdh-B1, Pgm-B2 and Aat-A1, which are surveyed by starch gel electrophoresis. A matrix of genetic distances among river populations indicated that an indivdual river population could not be regarded as a completely genetic isolated population because of exchange of individuals with neighbouring river populations. Analysis of a correlation between geographic and genetic distance among river populations revealed three routes of homing migration for spawning. The correlation also revealed that gene constiutions of two river populations separated by more that about 600km along the homing migration routes could be regarded as practically independent of each other.
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Kijima et al. (1982) studied this question.