According to Wikipedia, it looks like ther are 21 recognized and recorded species, 1 extinct species – the Silver trout, and many sub-species as well as some not formally named species. These are all divided into three of the seven genera in the subfamily slamoninae.
There are nine basic species of trout: Brown, Brook, Cutthroat, Rainbow, Dolly Varden, Tiger, Lake, Golden, and Splake. Each species also contains subspecies that have adapted to different environments.
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