The National Park Service will renew efforts to rid an area of the Colorado River in northern Arizona of invasive fish with a chemical treatment
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.
Once the treatment is complete, another chemical will be released to dilute the rotenone, the park service said. Due to climate change and drought, Lake Powell, a key Colorado River reservoir, dropped to historically low levels last year, making it no longer as much of an obstacle to the smallmouth bass. The predatory fish were able to approach the Grand Canyon, where the largest groups of the ancient and rare humpback chub remain.
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