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1 <br />NATIVE FISH WORK GROUP <br />ANNUAL REPORT - 1992 <br />INTRODUCTION <br />ME; A large adult population of the endangered razorback sucker exists in Lake <br />Mohave, but all available information shows the fish to be very old (ca. 40+ <br />it years). There is little recruitment to adulthood, and researchers expect the <br />population to crash by the turn of the century. The Native Fish Work Group <br />is a coalition of biologists and scientists from state and federal agencies and <br />universities that formed in 1990 with the single purpose to replace this aging <br />population with young adult fish from this same gene pool. As the species is <br />OK long-lived and has shown itself capable to survive in Lake Mohave for 40+ <br />years, this action would maintain the genetic diversity of the razorback sucker <br />and provide a large refugium stock to aid future recovery actions. <br />The Native Fish Work Group is rearing razorback suckers in isolated coves <br />and backwaters to a size at which they should be relatively immune from most <br />fish predators. The fish are then tagged and released into the lake. The true <br />"acid-test" for the program will be whether these fish, as young adults, show <br />up at known spawning areas around the. lake during March., and .April. <br />NFWG had an active year in 1992. A great deal was learned about on-site <br />propagation of razorback suckers, their ecology, behavior, and growth <br />potential. <br />YUMA COVE: <br />The Yuma Cove activities are highlighted herein, and detail information is <br />provided in the attached report, "Production of razorback sucker in a <br />backwater at Yuma Cove, Lake Mohave, Arizona and Nevada, 1992" by Mike <br />Horn and Paul Marsh (Appendix A). <br />E <br />0