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Marine Heat Wave Blamed for Salmon Collapse | Seattle News
A major marine heat wave is now blamed for the catastrophic collapse of Yukon River Chinook salmon, with scientists linking extreme ocean temperatures to skyrocketing deaths among adult and older juvenile fish en route to spawn. Once a thriving fishery with hundreds of thousands returning annually, the run hit an all-time low in 2022, triggering fishing closures across Alaska and Canada. While early survival and fishing were suspected, the study reveals ocean conditions—not harvests or bycatch—were the primary driver of the recent crash. The exact mechanisms remain unclear, but factors like…
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