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Results Movement Young Colorado squawfish moved only short distances during autumn and spring sampling periods. Of 112 fish marked and recaptured in autumn, 111 remained within the 8-km sections where they were originally marked; one fish moved downstream to an adjacent section. Of76 fish marked and recaptured in spring, all were caught in sections where they were originally marked. Recaptured fish were at large for 2 to 21 d. Twenty-six fish recaptured in spring were marked the previous autumn. Of these, 19 were captured in sections where they were originally marked, 6 were in adjacent downstream sections, and 1 was recaptured two sections upstream (7.4 km). These fish had been at large 170 to 200 d. Eight fish marked in autumn 1994 in the Canyonlands reach were recaptured the following summer by researchers involved in the investigation entitled Sampling for Larval Razorback Sucker in Canyonlands National Park and Glen Canyon National Recreation Area (R. T. Muth, pers. comm.). Three fish were captured in sections where they were originally marked, two were in adjacent downstream sections, and three had moved two sections downstream. These fish had been at large for 246 to 263 d and were recaptured in June just before peak runoff. No other marked fish were captured by other fishery investigators. Sampling dates for other fishery investigators that collected age-O and age-1 Colorado squawfish ranged from March to October 1993-1996, and sampling locations included upstream, within, and downstream of our study sites (Table 1). Relatively few age-1 Colorado squawfish were captured during post-runoff surveys conducted in July and August. In the Jensen reach, 15 age-1 fish were captured on 18-20 July 1994 (32 backwaters sampled with 121 seine hauls); none of these fish were marked. No 10