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Variability in the swimming ability of the razorbacks eclipsed any <br />differences associated with temperature in testing at USU in a stamina <br />tunnel. They were able to swim for an hour or more at a velocity of <br />1 ft/sec at 12, 20, and 260C, but only a few seconds at 2 ft/sec. <br />No laboratory TDS tests were planned on razorbacks. The radio tagging <br />data may be related to TDS measurements in the Duschesne and Green Rivers, <br />but the interpretation of these type data are limited. <br />Artificial Propagation and Disease <br />Propagation - No work on culturing these fish was done in 1980. <br />However, Willow Beach NFH produced one group of offspring in 1974 from <br />Lake Mohave (Toney 1974) that we used in our studies. The razorback suckers <br />Toney used were releasing eggs when captured so it was a simple matter <br />to take and fertilize them. In 1981, over 100 adults were taken from <br />Lake Mohave and transferred to Dexter NFH. These fish were in spawning <br />condition. Some were injected and some 100,000 eggs collected. <br />Disease - The group of razorbacks produced at Willow Beach in <br />1974 suffered an infestation of "Ich" (Ichthyophthirius multifiius). <br />The adults from the lake carried Lernaea cyprinacea and suffered from <br />damaged eyes with opaque lenses. Protozoan (Mxyosoma sp.) sporera <br />were found in the eyes of these fish. <br />In Fort Morgan's examination of adult razorbacks in 1980 one bacteria <br />(Erysipelothrix rhyslopathiae), a protozoan (Myxobolus sp.), and a copepod <br />(Lernaea cyprinacea) were found. <br />None were a serious problem for these <br />wild fish. <br />42