Alaska has been in the throes of an unprecedented heat wave this summer, and the heat stress is killing salmon in large numbers
Scientists have observed die-offs of several varieties of Alaskan salmon, including sockeye, chum and pink salmon.Stephanie Quinn-Davidson, director of the Yukon Inter-Tribal Fish Commission, told CNN she took a group of scientists on an expedition along Alaska's Koyokuk River at the end of July, after locals alerted her to salmon die-offs on the stream.
"2019 exceeded the value we expected for the worst-case scenario in 2069," she said.Mauger said that the warm temperatures are affecting salmon in various ways, depending on the stream. "Physiologically, the fish can't get oxygen moving through their bellies," Mauger said. In other places in the state, the salmon"didn't have the energy to spawn and died with healthy eggs in their bellies.
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