What's behind the decline of Yukon Chinook?

Increased natural mortality associated with Bering Sea marine heatwaves is "an important driver" of the Yukon River Chinook salmon crash, a new study finds.

The study also "found no evidence that harvest of adult salmon or bycatch removals prior to spawning have been significant factors in population level declines of Yukon River Chinook," says this write-up from NOAA Fisheries.