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- W1969334483 abstract "Abstract Hatchery and wild female spring Chinook salmon Oncorhynchus tshawytscha from the upper Yakima River were compared to determine whether their reproductive traits had diverged after a single generation of artificial propagation. Fecundity, relative fecundity, individual egg mass, and total gamete mass were all significantly correlated with body length, while reproductive effort (gonadosomatic index) was not. Regressions of trait versus body length often differed significantly among brood years. Hatchery spring Chinook salmon were significantly smaller than wild females over the four brood years examined. After brood year and body length (when necessary) were accounted for, wild females had an average of 8.8% more total gamete mass, 0.8% more individual egg mass, 7.7% greater fecundity, and 0.8% greater reproductive effort than hatchery females. Relative fecundity (the number of eggs per centimeter of body length) was on average 1.3% greater in hatchery females. We also compared body size at yolk absorption and egg‐to‐fry survival of the progeny from hatchery‐by‐hatchery and wild‐by‐wild matings. After differences in egg size were accounted for, hatchery fry were on average 1.0% heavier than wild fry. Egg‐to‐fry survival rates varied among years, with no consistent difference between hatchery and wild fry. The relationships between reproductive traits and body length were not significantly altered by a single generation of hatchery exposure. However, because hatchery females had smaller body sizes, the distributions of linked traits, such as total gamete mass and fecundity, differed by as much as 0.6 SD, probably resulting in some fitness loss. Our data support the idea that a single generation of state‐of‐the‐art conservation hatchery propagation can produce fish with reproductive traits similar to those of wild fish, given comparable body size." @default.
- W1969334483 created "2016-06-24" @default.
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- W1969334483 date "2008-09-01" @default.
- W1969334483 modified "2023-09-30" @default.
- W1969334483 title "Comparison of Female Reproductive Traits and Progeny of First-Generation Hatchery and Wild Upper Yakima River Spring Chinook Salmon" @default.
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- W1969334483 doi "https://doi.org/10.1577/t06-160.1" @default.
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