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<br />.k-.'"':> <br />~;;,,) <br />-. <br /> <br />Research Component- Hypothesis Testing <br />Task. No. 8 <br /> <br />No. : <br /> <br />(for MC usel <br /> <br />RECOVERY IMPLEMENTATION PROGRAM <br />FOR THE ENDANGERED FISH SPECIES <br />IN THE OPPER COLORADO RIVER BASIN <br /> <br />PY-1992 <br />SCOPB-OP-WORK <br />RBSEARCH PROPOSAL <br /> <br />Lead Agency: <br />Submitted by: <br />Address: <br /> <br />Utah Wildlife Resources <br />Leo Lentsch <br />. 1596 West North Temole. <br />Salt Lake City. UT 84116 <br />(8011 538-4756 <br />Auaust 6. 1991 <br /> <br />Cateaorv (check one) : <br />Ongoing project <br />-6- Requested new start <br />Unsolicited project <br />Outside funding <br /> <br />Phone: <br />Date: <br /> <br />I. Title of Proposal: Non-native fish management <br /> <br />II. Relationship to Recovery program/Ranking Factors: <br /> <br />Researchers studying the four endangered fishes of the Upper <br />Colorado River Basin are becoming increasingly aware of the <br />potential link between recruitment of young fish to adults and <br />interactions of non-native fishes. Successful management and <br />recovery of these endangered fishes, as well as management of other <br />co-occurring fishes (native and non-native), depend on a sound <br />understanding of how they interact with and are influenced by their <br />physical and biological environment. <br /> <br />III. Study Goals, Objectives, End Product: <br /> <br />This study addresses three objectives. <br /> <br />l)To identify and assess factors that limit the distribution and <br />abundance of all non-salmonid non-native fishes by taking a life <br />historical and zoogeographical perspective. Potential limiting <br />factors could be identified from literature and data associated with <br />existing museum collections of Upper Colorado River Basin fishes <br />and, for comparison, the substantial data on these fishes from <br />portions of their native ranges. To effectively address management <br />of non-native fishes in the Upper Colorado River Basin, it would be <br />extremely beneficial to determine potential limiting factors for <br />these fishes in their native ranges. <br /> <br />2)To evaluate the potential impact of northern pike on YOY Colorado <br />squawfish in Utah. This study will closely follow the investigation <br />of northern pike in the Y&mpa River, Colorado. <br /> <br />See Attachment <br /> <br />3)To identify and evaluate potential methods for selectively <br />controlling the impacts of non-native fishes of the endangered fish. <br />Potential methods (flow manipulation, removal, etc.) for selectively <br />controlling non-native fishes will be identified for each species. <br /> <br />C21 <br />