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Speaking of fish, I’ve read that when Yellowstone became a national park in 1872, the Firehole River had no trout.

Of course not! It’s too—too thermally altered! The water in the Firehole may be okay for bugs and bacteria, but not for fish!

Actually, there were no fish in the Firehole in 1872 because the central part of this park is a high plateau, surrounded by sheer cliffs and steep drops. These natural barriers prevented fish from entering waters that were otherwise livable. In the case of the Firehole River, fish were barred from moving upstream by the Firehole Falls. Rainbow and brown trout were introduced into this river in 1889 and stocking continued until the early 1950s.

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Cast of characters - Maya Crowbes, Dr. A Beadle, Gray Fischer, Viola DeRama
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Q: Are rainbow and brown trout native to the Firehole River?