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<br />A naturally isolated backwater at Yuma Cove, adjacent to Arizona <br />Bay on Lake Mohave, was identified for initial investigations <br />(Marsh and Langhorst 1988). The backwater first was treated with <br />ichthyocide in autumn 1984 to remove predatory non-native fishes, <br />then stocked in January 1985 with adult razorback suckers captured <br />from spawners that aggregated only meters away in the lake. Adults <br />spawned successfully and produced larvae that grew to more than 16 <br />mm TL by April. However, high lake elevations combined Guth strong <br />westerly winds to erode the berm that separated the backwater from <br />the lake, which allowed young fish to eshape and predatory non- <br />natives to invade. <br />The habitat was again treated in October 1985, at which time only <br />non-native species were recovered: Adult razorback suckers were <br />stocked in January 1986, larvae were present by late March, and <br />juveniles of the 1986 cohort attained 18.2 to 20.4 cm (n = 12) by <br />December. Adults in the backwater were augmented by additional <br />fish stocked in March 1987, however, the berm was breached soon <br />after to again allow re-invasion by non-native fishes and escape. of <br />both young (1986 and 1987 year-classes) and adult razorbacks. <br />Thus, only once among three attempts did the backwater remain <br />secure, and a small cohort of young razorback suckers was produced <br />(Minckley et al. 1991). Nonetheless, these attempts confirmed and <br />documented the potential of on-site spawning and grow-out.