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(Bozek et al. 1984), only four remained in the same locality. The <br />remainder moved up, down or across the lake 4 to 26 km. Of 24 <br />razorback suckers tagged in 1988 and recaptured in 1989, 12 were <br />stationary and 12 moved up, down or across lake 6.4 to 25 km <br />(Marsh and Minckley 1989a). Most fish tagged in 1988 and 1989 and <br />recaptured in the same year showed little movement. However, in <br />1989, two razorback suckers moved 6.4 km across Lake Mohave, and <br />one fish moved uplake 8 km in less than two days (Marsh and <br />Minckley 1989a). <br />Reproduction _ <br />Some aspects of the reproductive biology of razorback suckers <br />are relatively well-known (Douglas 1952, Jonez and Sumner 1954, <br />McAda and Wydoski 1980, Minckley 1983, Bozek et al. 1984, <br />Loudermilk 1985, Tyus 1987, Tyus and Karp in press). Razorback <br />suckers are highly visible in shallow coves of some reservoirs at <br />the onset of spawning season (Minckley 1983, Bozek et al. 1984). <br />Specific spawning habitat in reservoirs consists of shallow <br />(usually 0.3-2 m), flat or gently sloping offshore areas over <br />gravel, cobble, or mixed substrate types (Douglas 1952, Minckley <br />1973, Minckley 1983, Bozek et al. 1984, Mueller 1989). These <br />areas are located adjacent to gently sloping shorelines, at the <br />mouths of washes, or over terraces of wave-sorted gravel. <br />Razorback sucker spawning depressions (termed redds by some _ <br />investigators) overlay bands of offshore wave-sorted gravel and <br />cobble in Lake Mohave (pers. comm., G. Mueller, U. S. Bureau of <br />34 <br />