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• W788891742 abstract "The Central Valley fall-run Chinook salmon (Oncorhynchus tshawytscha) is the dominant population complex supporting the California and Southern Oregon commercial salmon fishery. The stock is largely dominated by hatchery productionand has shown high variability in adult returns, suggesting that hatchery practices are critical to thelong-term sustainability of the fishery. We compiled information from numerous sources to synthesizetrends in the number, location, size, and timingof fall-run Chinook salmon released from the five Central Valley hatcheries between 1946 and 2012. Approximately 2 billion fish were released duringthis period, nearly half of which were released from the single federally operated hatchery. Juveniles have been planted off-site in the estuary with increasing frequency since the early 1980s, particularly by state-operated hatcheries. Approximately 78% of all releases occurred between January and June, including ~25% in April and ~20% in May. Release timing and size trends differed among hatcheries,and were correlated. For example, the Coleman and Nimbus hatcheries tended to release small fish (<5 g, on average) early in the year, while the Feather, Mokelumne, and Merced hatcheries tendedto release larger fish (>10 g, on average) later in the year. Moreover, sizes-at-release (by month) haveincreased since the 1980s, leading to the emergence of a new life-history type that now comprises nearly all of the estuary releases: springtime releases of large ocean-ready “advanced smolts.” We collapsed release timing and size data into a single index of life-history diversity and our results indicate a reduction in juvenile life-history diversity, with decreased variability in release number, timing, and size through time. Together, these results indicate a reduction in the diversity of life-history types represented in the fall-run Chinook salmon hatchery releases, which may be a factor that contributes to the decreased stability of the Central Valley fall-run Chinook salmon stock complex." @default.
• W788891742 created "2016-06-24" @default.
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• W788891742 date "2015-06-26" @default.
• W788891742 modified "2023-10-10" @default.
• W788891742 title "Temporal Trends in Hatchery Releases of Fall-Run Chinook Salmon in California's Central Valley" @default.
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• W788891742 doi "https://doi.org/10.15447/sfews.2015v13iss2art3" @default.
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