Heat stress that killed thousands of salmon in Alaska is a sign of things to come, scientist warns

Scientists believe heat stress killed thousands of salmon in an Alaskan river last month. From July 7 to 11, communities along the Koyukuk River experienced sustained air temperatures of over 30 C, well above the seasonal average highs of less than 20 C. Shortly after the heat wave, locals began reporting an unusual number of dead chum salmon washing up on the banks of the river.

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