![]() ![]() Fish and Wildlife Service, American Fisheries Society, and all states throughout their historic range (Idaho, Oregon, Washington, Nevada, California and Montana) and are classified as a sensitive species by the U.S. In response to population declines, resident forms of redband trout are considered a species of special concern by the U.S. Long-term persistence of these populations is threatened by loss of migratory life history forms and connectivity with other populations which is critical to maintaining genetic diversity and dispersal among populations (Rieman and McIntyre 1995). Consequently, many populations are restricted to isolated headwater streams that may serve as refugia until effective conservation and rehabilitation strategies are implemented. Logging, mining, agriculture, grazing, dams, over harvest and hybridization and competition with other trout contributed to the decline of redband trout abundance, distribution and genetic diversity in the Columbia River Basin (Williams et al. The Columbia River redband trout (Oncorhynchus mykiss gairdneri), a subspecies of rainbow trout (Oncorhynchus mykiss), is native to the Fraser and Columbia River drainages east of the Cascade Mountains to barrier falls on the Pend Oreille, Spokane, Snake and Kootenai rivers (Allendorf et al. Montana Department of Fish, Wildlife & Parks
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