Assertion: coastal rainbow trout | /r/HasProperty | isolated in lake crescent
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text: The Beardslee trout (O. m. irideus var. beardsleei), a genetically unique lake-dwelling variety of the coastal rainbow trout that is isolated in Lake Crescent (Washington), is threatened by the loss of its only spawning grounds in the Lyre River to siltation and other types of habitat degradation.