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4 <br />ON <br />The Native Fish Work Group (NFWG) was organized in 1990 to utilize <br />the full potential of the on-site augmentation concept. This <br />multi-agency effort included Arizona Game and Fish Department, <br />Arizona State University, National Park Service, Nevada Division of <br />Wildlife (NVDOW), U.S. Bureau of Reclamation (BR), and FWS, with BR <br />providing substantial resources in behalf of the project. The <br />NFWGs goal was to allow razorback suckers to spawn in Yuma Cove, <br />transfer young to another location (Davis Cove, isolated' by netting <br />from Lake Mohave and depleted of non-native fishes) for grow-out, <br />then stock 30 cm TL sub-adults into the lake. <br />The berm between the Yuma Cove backwater and Lake Mohave was built <br />up and compacted in winter 1990-91 to preclude breaching even <br />during the most severe combination of weather and lake level. At <br />the same time the backwater was deepened. Fishes were removed by <br />ichthyocide and adult razorback suckers from adjacent spawning <br />areas were stocked. Larvae were common and readily captured during <br />February, March, and April, but were not found in later samples -- <br />losses to unknown causes resulted in unsuccessful production of <br />juveniles (NFWG, unpublished data). <br />Another attempt was made in 1992. That effort proved successful, <br />and results constitute the remainder of this report. <br />is <br />0 <br />•