FILE - Juvenile smallmouth bass sit at a National Park Service laboratory near Page, Ariz., July 1, 2022. The National Park Service will renew efforts to rid an area of the Colorado River in northern Arizona of invasive fish by killing them with a chemical treatment, the agency said Friday, Aug. 18, 2023. It's the latest tactic in an ongoing struggle to keep non-native smallmouth bass and green sunfish at bay below the Glen Canyon Dam and to protect a threatened native fish, the humpback chub. (Jeff Arnold/National Park Service via AP, File) AP PROVIDES ACCESS TO THIS PUBLICLY DISTRIBUTED HANDOUT PHOTO PROVIDED BY NATIONAL PARK SERVICE; MANDATORY CREDIT.

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