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Nonnative fish species compete with native fishesceciesinoseveral ways. Physical factors in the environment regulate aquatic life. Suitable habitat and food particular area to support resources are the primary limitingteacitors. ncreasBng athe numberooftspecies physical habitat available is fin uber of most present in eize?ofteachaspeciesapopulationlinrthepsystem is species. The habitat controlled by the ability of each life sagetoothemphysical featuresaof food resources. The species better adapted were the habitat would likely be a better competior lveessspeci well adapted species, and thus have larger populations. well adapted to conditions in e nobasin nnativeifishesdarelqumtetcompetitive under current altered conditions and viable. C. Federal Action: This Environmental AssNational)Enis eing vironmentalePolicy under the implementing regulations of the Act (NEPA). The Federal action is the pai ciationt of theaFish and Wildlife Service (Service) in a Cooperative routine stocking of nonnative ihes i situations that was be determined through the NEPA and section 7 process., : The stoc D. Area to be Covered by Stocki Presentedsto the wildlife commkssgons for aive will beP procedures alternt action, as appropriate, for the States of Colorado, Utah, and Baoming. The procedures are intended to cover the Upper excluding the San Juan River drainage, which includes the Colorado River and all its tributaries (Figure 1). H. BACKGROUND The purpose of the Endangered Species Atland,this to reatenedvspecies edepend, conserve the ecosystems upon which endangered and to provide a program for the conservathenRof listeImspecies iondProgram authority of the Endangered Species Act, Basi for Endangered Fish Species in the 1988r CSignatorReseto this RecoveryyProgram Program) was formalized in January the Secretary of the were the Governors of Colorado, Utah, and Wyoming; Interior; and the Administrator of the Western t Area Power Administration. d fishes The purpose of the Recovery Program is to recover it providing for existing and new water development to proceed in the Upper Basin also Rec Pro in compliance with the nandg prudent ealternativeTto avoidethe likelihood of to serve as a reasonable jeopardy to the continued existence of thetendanhabitafi heseand to7avoid the destruction or adverse modification of criical aretorl) habitat projects. in ion c and consultations on water depletion impacts related to.hi The five principal elements of the Recovery Program management, 2) habitat development and maintenance, ) native fish stocking, 4) nonnative species and sport fishing, a ) research, data management, and stocking procedures being monitoring (Fish and Wildlife Service 1987)• The sidelines to reduce being developed address number 4 above by implementing g eliminate impacts from nonnative fishes. 3