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The Oregon Department of Fish and Wildlife manages the Suttle Lake fishery. The lake's fish population includes rainbow trout, brown trout, kokanee salmon, and mountain whitefish. Much of the population is self-sustaining. However, the Department of Fish and Wildlife regularly stocks the lake with rainbow trout to maintain a balance of fish populations. The brown trout and kokanee salmon are particularly sought after by anglers. The lake's brown trout can weigh up to . Brown trout weighing to are relatively common. The kokanee salmon average to . The mountain whitefish average to .