A new study suggests that a booming population of hatchery-raised salmon in Southeast Alaska could put pressure on thousands of miles of salmon streams that are already vulnerable due to climate change. Scientists say hatchery fish could create overcrowded, smothering conditions as climate change makes Southeast salmon streams hotter and drier.
In 2013, researcher Chris Sergeant was doing some routine water quality monitoring in Sitka’s Indian River when he noticed something strange on the oxygen monitor.
“We have too many salmon breathing too much oxygen,” Sergeant said. “It’s an unnaturally high population.” 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.
And salmon’s risk of hypoxia is made worse by human-caused climate change. Rising water temperatures across the region have been linked toWhen hot temperatures are accompanied by drought, salmon streams are even more primed for hypoxia. That’s because an ideal salmon habitat is rough and fast-flowing. That kind of water is oxygen rich.
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