Of the 28 fish species present in the forest, 11 are not native and have been introduced by humans. Rainbow trout, chinook salmon, westslope cutthroat trout, bull trout, and mountain whitefish are all native to some of the forest's waterways, while brook trout are a common invasive species that compete with the forest's salmonids. The forest's management indicator species is bull trout because they are sensitive to habitat changes and depend on specific habitat conditions. Sockeye salmon are native to the Salmon River watershed in the northern part of the forest, but dam construction on the Columbia and Snake rivers has hampered the migration of this anadromous fish and caused its population to collapse. Warm Lake supports the forest's only native population of Kokanee salmon, the resident (non-migratory) form of sockeye salmon. However, due to introductions by humans, Anderson Ranch, Arrowrock, Lucky Peak, and Deadwood reservoirs now support populations of Kokanee salmon. To provide additional recreational fishing opportunities, the Idaho Department of Fish and Game stocks several of the forest's waterways with rainbow trout, while reservoirs are also stocked with Kokanee or chinook salmon and Lake Cascade is stocked with coho salmon and steelhead, the anadromous form of rainbow trout.