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<br />) <br /> <br />COLORADO RIVER RECOVERY PROGRAM <br />FY 97 ANNUAL PROJECT REPORT <br /> <br />RECOVERY PROGRAM <br />PRO] NUMBER: ~ <br /> <br />1. Project Title: Green River Non-native Fish Management and Pilot Removal <br /> <br />II. Principal Investigators: <br />Utah Division of Wildlife Resources <br />Lentsch. Tom Chart <br />1596 West North Temple <br />Salt Lake City. UT 84116 <br />(801) 538-4756 <br /> <br />Utah State University Leo <br />Todd Crowl <br />Fisheries and Wildlife Dept. <br />LOl.'an. UT 84322 <br />(80!) 797-2498 <br /> <br />III. Project Summary: Developing and implementing management options for controlling <br />nonnative impacts in the upper basin has recently become a high priority within program <br />management. Because of this, a draft strategic plan has been developed to help guide <br />nonnative control actions. The increased emphasis on nonnative control is based largely <br />on observational data historically collected by the Service and more recently <br />observational and experimental data collected by Utah (Crowl and Lentsch). In summary, <br />the nonnative fish community is pervasive throughout the system, with foci being found <br />in the DuchesnelWhite River confluence, as well as near the YampalGreen confluence <br />(Muth, personal observation). <br /> <br />The primary target nonnative fish are channel catfIsh and centrachids. We feel that the <br />evaluation of three different habitat/geomorphic reaches is very important to determine <br />if, when, and where mechanical removal will be the most effective for reducing negative <br />interactions with native species in the upper basin. These three sites represent most <br />habitats and geomorphic reaches found in the upper basin. The purpose of this study is to <br />mechanically remove charUIel catfish to reduce the interactions with native species in <br />two specific areas: Gray Canyon reach (RM 328-338) of the Green River and to <br />determine ifremoval of these fish is effective and feasible. <br /> <br />Task I Remove target species (charUIel catfish). <br /> <br />Task 2 Evaluate effectiveness and feasibility of reducing negative interactions with fish <br />removal <br /> <br />Task 2a <br /> <br />Determine whether removal of channel catfish is feasible. Determine if <br />geomorphology (compare between reaches) affects the feasibility of <br />removal efforts. <br /> <br />Task 2b <br /> <br />Determine if native species respond to large-scale removals efforts (e.g., <br />increased relative abundance, enhanced survivorship and growth). Identify <br />negative interactions caused by target species. <br /> <br />Task 2c <br /> <br />Determine the longevity of mechanical removal, in terms of relative <br />abundance of channel catfish. <br /> <br />1 <br />