Confirming their worst fears for record-low lake levels, National Park Service fisheries biologists have discovered that a non-native predator fish has made its way through Glen Canyon Dam to the lower Colorado River, where it can prey on ancient native fish they have been working to reestablish.
Juvenile smallmouth bass sit at a National Park Service laboratory near Page, Ariz., July 1, 2022. Confirming their worst fears for record-low lake levels, NPS fisheries biologists have discovered that smallmouth bass, a non-native predator fish, has made its way through Glen Canyon dam and appear to have spawned in the lower Colorado River, where it can prey on humpback chub, an ancient native fish they have been working to reestablish.
“It’s pretty devastating to see all the hard work and effort you’ve put into removing other invasive species and translocating populations around to protect the fish and to see all that effort overturned really quickly,” Healy said. Under the Endangered Species Act, government agencies are required to operate in ways that will not “jeopardize the continued existence” of listed animals. That includes infrastructure.
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Biologists' fears confirmed on the lower Colorado RiverSmallmouth bass feast on humpback chub, a threatened fish that’s native to the Colorado River. The predators wreaked havoc in the upper river, but were held at bay in Lake Powell where Glen Canyon Dam has served as a barrier for years — until now.
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