NPS to use piscicide to kill off invasive fish in Colorado River
Wildlife officials with the National Park Service are planning to use a specialized poison next week to kill off an invasive fish species and make room for endangered natives in the Colorado River. The move should help to remove invasive smallmouth bass and green sunfish from the river below Glen Canyon Dam, inside the Glen Canyon National Recreation Area, according to NPS officials. The two fish have been threatening smaller native species like the humpback chub, which is listed as threatened under the Endangered Species Act.