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Science & ResearchJul 31, 2026

Long-term decline in egg size of Japanese hatchery chum salmon links to declines in return rate and abundance

Variation in life-history traits contributes to fitness and population productivity in salmonids.

Variation in life-history traits contributes to fitness and population productivity in salmonids. To investigate long-term changes in egg size and body size of Japanese hatchery chum salmon and their links to declines in return rate and abundance, I analyzed egg size and female…

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