Genetic variability and differentiation of populations of chum salmon Oncorhynchus keta (Walbaum) from the southern Russian Far East

Allozyme variation of populations of chum salmon Oncorhynchus keta from southern Russian Far East was examined. Of 55 loci screened, 31 were polymorphic. Within-population variation accounted for most of the allele diversity; FST averaged over loci was 0.052. Linkage disequilibrium was found in less than 5% of locus pairs in the chum population examined. Analysis of within- and among-population variance components of linkage disequilibrium using D-statistics (Ohta, 1982) showed that most genetic variation was distributed among populations.