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suckers in Lake Mohave. However, Bozek et al. (1984) questioned <br />whether sampling techniques used in Lake Mohave studies were <br />adequate to document presence of juvenile razorback suckers, <br />especially in heavily vegetated littoral zones, and also <br />questioned whether all adult individuals were old. Four small <br />juvenile razorback suckers captured in 1987 at the upstream end <br />of Lake Mohave indicated at least limited survival of this life <br />stage (Marsh and Minckley 1989b). <br />Razorback suckers are also found occasionally in LCRB <br />canals, tributaries, and the mainstream Colorado River (Minckley <br />1973, Marsh and Minckley 1989b, Mueller 1989). These were <br />usually one or a few large individuals caught incidentally by <br />fishermen or survey crews (Minckley 1983, Marsh and Minckley <br />1989b). These areas include the Paria River (Minckley and <br />Carothers 1979), and the mouth of the Little Colorado River <br />(Maddux et al. 1987, pers. comm., D. A. Hendrickson, Arizona Game <br />and Fish Department). Suttkus and Clemmer (1979) collected three <br />razorback x flannelmouth sucker hybrids in the Grand Canyon. <br />Mueller (1989) also reported that spawning razorback suckers were <br />common (50 to 75 annually) in riverine habitat below Hoover Dam <br />and he recorded production of viable eggs and larvae. Marsh and <br />Minckley (1989b) summarized the scattered occurrence of larval, <br />juvenile, and adult razorback suckers from the lower Colorado <br />River downstream of Lake Mohave, most of which were collected _ j <br />from irrigation canals. Although some could have been recently <br />stocked, hatchery-produced individuals, some were thought to be <br />12 <br />