Evaluating contributions of hatchery-origin fish to conservation of endangered Sacramento River winter run Chinook salmon during a drought

Neil Thompson

This project evaluated multiple aspects of how hatchery-reared fish contribute to natural production of winter-run Chinook salmon in the upper Sacramento River. The researchers assessed whether hatcheryreared fish are spawning in the wild and producing natural-origin offspring using a novel panel of genetic markers developed during the study. The study also assessed if inadvertent domestication selection was occurring in the hatchery during the drought years and if more highly related hatchery broodstock pairings returned fewer offspring than less related pairs.

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