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Movement. Although movement patterns are poorly d~umented, roundtail chub have been described as sedentary and mobile, depending on life stage and habitat conditions. After emergence from spawning substrate, roundtail chub larvae may drift with the current or move into backwater areas for feeding. Roundtail chub larvae made u 6 and 13.1 % of drifting larval fish captured by Carter et al. (1986) in the Colorado P River at Parachute and Palisade, Colorado, respectively. Haines and Tyus (1990) also found drifting roundtail chub larvae us the Yampa River. ~ Long-distance migrations to specific spawning sites have not been observed for roundtail chub, but spawning movements have been noted. In the upper Colorado River near Bl k Rocks Colorado U Kaedin et al. (1990) found radio-tagged roundtail chubs to ac tah, g move extensively (average maximum displacement of 33.9 km) during the spawning season. Holden and Crist (1981) marked 41 roundtail chubs in the Green River below Flaming Gorge Dam, recapturing only two; one at the original capture location four days later and the other a year later and approximately 80 km downstream. Brooder et al. 1 1 (2000) marked 361 roundtail chubs in two reaches of the upper Verde River and recaptured 70. Mean net displacement for recaptured fish was 263.9 m (range 0-5.7 km; Brooder et al. 2000). Bryan anal Robinson (2000) reported roundtail chubs in the Verde and Salt rivers to be relatively sedentary. Beyers et al. (2001) similarly found roundtail chubs in the Colorado River near Grand Junction, Colorado made small, localized movments during the day and more extensive movements at night. Seasonal movement to different habitats is another reason suggested for observed movement of adult roundtail chub. Seibert (1980) found that fish (roundtail chub included) moved seasonally into canyon reaches of Aravaipa Creek, Arizona, during the winter and into valley reaches in the summer. Bestgen et al. (1987) did not observe roundtail chub movement in the Gila River drainage among the few specimens tagged, suggesting that seasonal movement is not ubiquitous. Final Report September 2002 20