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Bull trout in Holland Lake are unique yet vulnerable. Holland Lake harbors a “disjunct” core area population of bull trout meaning that bull trout spawn in Holland Creek and mature in Holland Lake rather than migrating to Swan Lake like most bull trout in the Swan watershed. In 2010, the US Fish and Wildlife Service designated the Holland Lake core area as critical habitat because it contains the features essential for bull trout conservation. They have very specific habitat requirements such as clean water with very little fine sediment in...
