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viable mechanical control options for centrarchids. Further <br />expansion of walleye Stizostedion vitreum vitreum in the UCRB <br />could be prevented by eliminating future stockings in reservoirs <br />and installing fish barriers to reduce downstream movement from <br />reservoirs. <br />Key Words: biological control, chemical control, endangered <br />fishes, mechanical control, native fishes, nonnative fishes, <br />physicochemical control, Upper Colorado River Basin <br />8