Study Details Adult Spring Chinook Mortality From Willamette Falls To Tributaries, Sea Lion Injuries

Some 10 percent to 21 percent of adult spring chinook migrating in the Willamette River will die before reaching tributaries to spawn, according to a recent study, and the fish most likely to die are those that were injured downstream of Willamette Falls by sea lions, as well as from other migratory-related causes such as descaling and head injuries.

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