Is stocking trout in a lake bad for the ecosystem?



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    Studies have shown that stocking lakes with large quantities of trout, especially in the non-native regions of high elevation western states, has drastically reduced the native amphibian populations.  In particular, a study from Idaho cited the decline in Long-Toed Salamanders and Columbia Spotted Frogs and their eggs and larvae, in any of the study cites that held stocked Cutthroat and Rainbow Trout.  Historical records show that between 1937 and 1938, Idaho Fish and Game stocked over 60,000 trout and again in the 1960’s they began to restock every three to six years, leading to a total of around 300,000.  This influx of game-fish has also drastically reduced the numbers of native trout species in these regions.

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