Crayfish – Aquatic Groundskeepers

Crayfish are freshwater crustaceans related to shrimp, lobster, and crabs. They’re all decapods—having ten legs. According to the U.S. Geological Survey, the native range for the Signal crayfish (Pacifastacus leniusculus) is the Columbia River’s lower estuary. The range goes northwest and through tributaries that reach into British Columbia, Washington, Idaho, and Oregon. Historical records say crayfish were first introduced to …