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r <br />found concentrated in a few localities during spring runoff in the 15-mile 1 <br />reach; they would then disperse throughout the Grand Valley. Much of the <br />movement between late June and late August may represent migrations to and <br />from spawning areas, or movements in search of such habitats. The range <br />of one fish extended as far upstream as the Price Stub Dam, while several ' <br />others spent part of the year in the Gunnison River, a few moved out of <br />the Grand Valley and traveled downstream as far as RM 130 (Fig. 9). Some ' <br />of these movements were no doubt related to spawning activity; however, <br />movement after the spawning period may serve to disperse individuals, , <br />thereby minimizing intraspecific competition. Thus the 15-mile reach is <br />used by some adult squawfish year round; by others, most of the year a <br />except during the spawning period. Some use it as a wintering area only; I <br />others move there prior to spring runoff and apparently then take advan- <br />tage of the flooded gravel pits and large backwaters during the high-flow , <br />period. It is also periodically used during the spawning season by some <br />adults from downstream reaches. <br />Razorback Sucker <br />In 1986, the single razorback sucker that was tracked left the 15-mile <br />reach within one week after release and spent the remainder of the year in <br />a side channel near WWA (Fig. 6). Contact with this razorback was lost ' <br />during May and June, 1987, when the fish may have moved to a spawning ' <br />site. It was later located downstream (RM 158.8), but then moved up to a <br />deep pool at RM 168.5 where it remained until at least the beginning of , <br />April 1988. It was next located in the 15-mile reach near the 1986 point <br />of capture. However, in mid May it moved upstream to RM 180.0. In late ' <br />May it moved downstream but stayed within the 15-mile reach through the ' <br />22 <br />1