The
McCloud River redband trout (
Oncorhynchus mykiss stonei) is one of three
redband trout subspecies of the
rainbow trout in the
Salmonidae family. The trout is native in small tributaries of the
McCloud River and
Pit River which are tributaries of California's
Sacramento River. Its historic range has declined significantly since it was first described in 1894. Remaining populations of genetically pure McCloud River redband trout are threatened by predation, habitat loss, competition with introduced trout species and by hybridization with hatchery rainbow trout
introduced to support
sport fishing .