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of razorback during the systematic sampling program are too <br />to derive any distribution and abundance conclusions, other than <br />that they are clearly in very low numbers. There are, ostensibly, spawning <br />concentrations present in the tipper Colorado and Green Rivers in May and June. <br />Substantial numbers were collected at that time from somewhat confined areas. <br />No razorbacks have been collected in the Little Colorado nor from the <br />immediate environs of the main Colorado. <br />Numbers of razorbacks are still being observed in Lakes Mohave, <br />Mead, and Havasu but these appear to be extremely old fish approaching senility. <br />Migration and Movement <br />Data generated by this study provided little information on migratory <br />patterns of the razorback suckers. The capture of one razorback tagged <br />five years ago 125 miles from the tagging site-illustrates that they <br />may move considerable distances. <br />The one tag recovery recorded by the Grand Junction field team was <br />attached to a fish captured in the Walter Walker Wildlife Management <br />Area and recaptured 11 days later. Other workers have noted this apparent <br />M <br />rather static population in this atypical gravel pit environment. <br />Habitat Selection <br />Some information on habitat selection of razorbacks was derived <br />from the one radio tagged razorback tracked in the Green River during <br />1980. This radio-tagged razorback migrated into the Duchesne River <br />shortly after release and remained there until toward the peak of the <br />spring runoff. There it selected relatively shallow areas of low velocity. <br />40