Brook stickleback established in Eastern Washington
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This note documents the first record of brook stickleback in Washington. Brook stickleback (Culaea inconstans) is established in the upper 36 km of Rock Creek, Spokane County, Washington. Rock Creek is a tributary of the Palouse River, which drains into the Snake River. Collections prior to 1999 yielded no brook stickleback in this drainage, leading us to believe that the species was recently introduced. This is the fifth record of occurrence west of the continental divide in the United States since 1995. Brook stickleback were previously collected in the Swan/Flathead River drainage in Montana, Green River drainage in Utah, Elk River drainage in Colorado and Klamath River drainage in California.