Genetic Differences among Populations of Alaskan Sockeye Salmon

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Abstract
Biochemical genetic variation was found among populations of sockeye salmon Oncorhynchus nerka in the Russian and Karluk river systems in Alaska. Significant differences in allele frequencies of lactate dehydrogenase (Ldh‐4), phosphoglucomutase (Pgm‐1), and cis‐aconitase (Aco) were found between the early and late runs in both the Karluk and Russian rivers, and between fish from the two rivers. The most common allele for Aco in the Russian River fish was lacking in fish from the Karluk River. Gene frequencies were stable between years, except for 1 year in Karluk River fish. Within the Karluk system, there were no significant genetic differences between groups of early‐run fish, or between groups of late‐run fish. Average heterozygosities (H) fell within ranges reported for other populations of sockeye salmon. Our data suggest that the two runs of sockeye salmon in each river system are now reproductively isolated as a result of natural events. Received August 8, 1983 Accepted November 28, 1984

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