The Upper Colorado River Endangered Fish Recovery Program is working to recover endangered fish while also working to minimize the impact on non-native sport fishing. In general, stocking nonnative fish species in the upper Colorado River basin has been confined to areas where there is little potential conflict with endangered fish. Because trout tend to live in different parts of the river, they are not considered competitors with endangered fish and are not affected by nonnative fish management activities.
Currently the greatest threat to native fishes in the Upper Colorado River Basin is the increased abundance and distribution of northern pike, smallmouth bass and channel catfish. Programs to reduce the expansion and impacts on native fishes have begun in the Green, Yampa and Duchesne rivers. All reduction efforts are coordinated with state wildlife resource management agencies, and where feasible, nonnative game fishes removed from these rivers are moved to off-river impoundments to provide angling opportunities.