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<br />COLORADO RIVER RECOVERY PROGRAM <br />FY 94 ANNUAL PROJECT REPORT <br /> <br />RECOVERY PROGRAM <br />PROJECT NUMBER: 24 <br /> <br />I. Project Title: Control of Nonnative Fish at the Confluence of Green <br />and Duchesne Rivers <br /> <br />II. Principal Investigators: <br />Leo Lentsch <br />Utah Div. Wildlife Res. <br />1596 West North Temple <br />Salt Lake City, UT 84116 <br />801/538-4756 Fax: 801/538-4709 <br />"NRDOMAIN,nrdwr.LLentsch@email. <br />state.UT,US. <br /> <br />Dr. Todd Crowl <br />Fisheries & Wildlife <br />Utah State University <br />Log an, UT 84321 <br />801/797-2498, <br />FAX: 801/797-1871 <br />facrowl@cc.usu.edu <br /> <br />III, Project Summary: <br /> <br />This study will document possible management strategies to enhance <br />survival of native fishes by determining the potentially most <br />important fish predators by species, size, area(s) of use, and <br />time(s) of use. Objectives'are to determine: 1) growth and <br />survival of juvenile squawfish in backwater areas with the use and <br />without the use of cages; 2) the potentially most damaging size <br />classes and species of nonnative fish predators; 3) the feasibility, <br />in terms of effectiveness and duration, of predator exclusion <br />devices for minimizing mortality from nonnative fish predation; 4) <br />when predator exclusions are most effective in minimizing mortality; <br />and 5) if selective predator removal (with gill nets, trawling, <br />electrofishing, chemical application, or other means) is a viable <br />option, at least in localized areas. <br /> <br />IV, Study Schedule: <br />a. Initial year: 1992 <br />b, Final year: 1995 <br /> <br />V, Relationship to RIPRAP: Green River Action Plan: Duchesne River <br />III.A,I. Identify most damaging nonnative fishes, III.A,2. Assess <br />options to control negative interactions from nonnative fishes from <br />the Duchesne River to benefit Colorado squawfish and razorback <br />sucker young-of-the-year, <br /> <br />VI, Accomplishments of FY 94 Tasks and Deliverables, Discussion on <br />Initial Findings and Shortcomings: <br /> <br />Over the past two years, we have quantitatively assessed the <br />densities of nonnative fish species in the Ouray nursery habitat <br />section of the Green River down to the bridge near the Duchesne <br />River, While we originally proposed to monitor exotic species <br />distributions continuously downstream beyond the White River, we <br />have been unsuccessful in obtaining a Ute Indian permit. Thus, our <br />sampling area includes 12 reaches ranging from the Jensen Bridge to <br />Sand Wash, These 100-300 m sections were electroshocked monthly <br />beginning in June and ending in October. Estimates of fish <br />