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In 2001, California began removing non-native trout from high-Sierra lakes; by 2011 nearly 44,000 fish were removed from 19 lakes, as frogs in three restoration lakes rose from about 190 to over 18,80...
surveys in three restoration lakes recorded an increase from nearly 190 frogs and tadpoles to more than 18,800. The National Park Service says the project helped restore ecological balance and placed the frog population in a stronger position to face other threats, including deadly fungal disease.
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From 1870 to 1988, California stocked mountain lakes with trout for anglers; the fish helped push yellow-legged frogs from 92% of their historic Sierra Nevada range - The Times of India
https://timesofindia.indiatimes.com/science/wildlife/from-1870-to-1988-california-stocked-mountain-lakes-with-trout-for-anglers-the-fish-helped-push-yellow-legged-frogs-from-92-of-their-historic-sierra-nevada-range/articleshow/134070933.cmsIn 1877, trout began entering Yosemite’s fish-free mountain lakes. More than a century later, a native frog is finally showing signs of recovery
https://timesofindia.indiatimes.com/science/in-1877-trout-began-entering-yosemites-fish-free-mountain-lakes-more-than-a-century-later-a-native-frog-is-finally-showing-signs-of-recovery/articleshow/133211890.cmsScientists removed trout from a California mountain lake; the recovery was visible not just in frogs, but in insects and birds | - The Times of India
https://timesofindia.indiatimes.com/science/nature/scientists-removed-trout-from-a-california-mountain-lake-the-recovery-was-visible-not-just-in-frogs-but-in-insects-and-birds/articleshow/134182138.cmsFrom 1886 to 1968, more than 20 million fish were stocked in waters that became Rocky Mountain National Park; in 2026 crews treated 14.3 miles to remove non-native fish and restore threatened greenbac...
https://timesofindia.indiatimes.com/world/us/from-1886-to-1968-more-than-20-million-fish-were-stocked-in-waters-that-became-rocky-mountain-national-park-in-2026-crews-treated-14-3-miles-to-remove-non-native-fish-and-restore-threatened-greenback-trout/articleshow/133710094.cms