Historically, spring-run and fall-run Chinook salmon have been considered as separate subspecies, races, ecotypes, or even as separate species of fish. A new genetic analysis, however, shows that the timing of migration in Chinook salmon is determined entirely by differences in one short stretch of DNA in their genomes. https://www.sciencedaily.com/releases/2020/10/201029142019.htm
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Spring-run and fall-run Chinook salmon aren’t as different as they seem
