Evolving over millennia through the melting
glaciers, great floods and fire that have shaped the western landscape,
native trout have survived in an unmatched variety of habitats. From
the cold alpine streams of the northern Rockies to the alkaline waters
of Great Basin desert lakes, they are the masters of adaptation.
Unfortunately, native trout cannot always adapt
to us. Logging, livestock grazing, and mining can clog streams with
silt and pollution, exposing native fish to high temperatures and
poor water quality. Dams and water diversions often leave little or
no water for fish. Introduced non-native fish compete with native
trout for food and habitat and interbreed with them, diluting their
genetic fitness and ability to survive in environments as diverse
as the West itself.