Scientists have long-warned that hatchery salmon can compete with wild fish for resources, including oxygen.
And for more than half a century, hatchery production across Alaska has boomed, especially for pink and chum salmon.
The study maps more than 10,000 miles of wild salmon habitat in Southeast Alaska that are close to hatchery release sites, creating the potential for overcrowded streams. “The more the water tumbles and foams, like a rapid, the more opportunity it has to exchange with the atmosphere,” Sergeant said. “That tumbling motion of the water is basically injecting oxygen.”
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