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Pacific Northwest heat wave sets up 'grim' migration for salmon | News


SEATTLE — This is shaping up to be a dire summer for fish and trees.
Temperatures in the Columbia and Snake rivers are already within two degrees of the slaughter zone of 2015, when half the sockeye salmon run was lost because of high water temperatures. An estimated 250,000 sockeye died that year long before reaching their spawning grounds.
The sockeye run is at its peak right now just as temperatures hit record highs across Washington state and in Idaho. Spring and summer chinook and steelhead migrating in the rivers also are at risk.
Salmon are cold-water animals. Temperatures above 62 degrees make them more vulnerable to disease, and as temperatures climb higher, they will stop migrating altogether. ....

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