Oncorhynchus
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Body size and egg size trends in Japanese hatchery chum salmon: Links to declines in marine survival and abundance
Japanese chum salmon (Oncorhynchus keta) populations supported by one of the world largest hatchery programs have experienced severe declines in marine survival and abundance. To evaluate long-term changes in reproductive traits, we analyzed temporal and geographic variation in female fork length (FL) and egg size from 13 hatchery-enhanced rivers in Japan during 1999-2019. Females from northern rivers tended to have smaller FL but produced larger eggs, indicating persistent latitudinal...