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<br />!' <br /> <br />t 11~3 i <br /> <br />" <br /> <br />PROPOSED MODIFICATION TO MECHANICAL REMOVAL <br />OF NON-NATIVE FISH FROM THE COLORADO RIvER <br />IN GRAND CANYON, ARIzONA <br /> <br />BUREAU OF RECLAMATION <br />Upper Colorado Region <br />Salt Lake City, Utah <br /> <br />U.S. GEOLOGICAL SURVEY <br />Grand Canyon Monitoring and Research Center <br />Flagstaff, Arizona <br /> <br />< <br /> <br />NATIONAL PARK SERVICE <br />Grand Canyon National Park <br />Grand Canyon, Arizona <br />Glen Canyon National Recreation Area <br />Page,Arizona <br /> <br />July 2003 <br /> <br />INTRODUCTION <br /> <br />In September 2002, the Bureau of Reclamation, National Park Service and U.S. <br />Geological Survey released an environmental assessment on proposed experimental <br />releases from Glen Canyon Dam and removal of non-native fish from the Colorado River <br />in Grand Canyon (Department of the Interior 2002). The experiment was developed by <br />the Grand Canyon Monitoring and Research Center (GCMRC, U.S. Geological Survey), <br />cooperating scientists, and the Technical Work Group of the Glen Canyon Dam Adaptive <br />Management Program. It was recommended to the Secretary of the Interior by the <br />Adaptive Management Work Group, a Federal Advisory Committee charged with <br />providing input to the Secret~ry rl1r~n~:nt t(' filUilling p!ovision~ ofth~ G!a~d t.:.a!!j'cn <br />Protection Act. In December 2002, following public meetings and responses to comments <br />by the federal agencies, the Secretary of the Interior concurred with a Finding of No <br />Significant Impact for the proposed project and agreed that it should move fOIWard, <br /> <br />In January 2003 GCMRC began implementation of non-native fish control in the Little <br />Colorado River (LCR) inflow area of the Colorado River in Grand Canyon. The objective <br />of this experiment is to reduce the number of non-native fishes that potentially prey on or <br />compete with the federally endangered humpback chub (HBC, Gila cypha) in this reach <br />of the river. The fish control effort uses electro fishing and has three primary purposes: a) <br />detennine the efficacy of this technique to reduce and control the number of non-native <br />fishes in critical habitat for the humpback chub, b) assess native/non-native fish <br />interaction by conducting diet and incidence of predation studies on non-native fishes <br />