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<br />4 <br /> <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 /> <br />The berm between the Yuma Cove backwater and Lake Mohave was built <br /> <br /> <br />up and compacted in winter 1990-91 to preclude breaching even <br /> <br /> <br />during the most severe combination of weather and lake level. At <br /> <br /> <br />the same time the backwater was deepened. Fishes were removed by <br /> <br /> <br />ichthyocide and adult razorback suckers from adj acent spawning <br /> <br /> <br />areas were stocked. Larvae were common and readi ly captured during <br /> <br /> <br />February, March, and April, but were not found in later samples <br /> <br /> <br />losses to unknown causes resulted in unsuccessful production of <br /> <br /> <br />juveniles (NFWG, unpublished data) . <br /> <br />Another attempt was made in 1992. That effort proved successful, <br /> <br />and results constitute the remainder of this report. <br />