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Old Charley Wash. Long distance movements were presumably associated with spawning; all movements occurred during the spawning season, and the majority of fish were ripe when captured. Other mark-recapture studies in rivers and associated habitats also suggests both movement and sedentary existence for razorback suckers (Vanicek 1967, McAda and Wydoski 1980, Valdez et al. 1982a). Most fish were recaptured within 2 km of their release sites, however, many of these were marked and recaptured within the same gravel pit-ponds. Razorback suckers were formerly attracted in springtime to off-channel gravel-pit habitats of the Colorado River in the Grand Valley (McAda and Wydoski 1980, Valdez et al. 1982a). Most of the razorback suckers tagged and released in the gravel pit ponds stayed there for varying periods. However, Valdez et al. (1982a) recaptured two fish that moved from the Walker Wildlife Area pond to a gravel pit pond and a backwater 22.7 km and 26 km upstream, respectively. Repeated sampling at tagging localities, without equal effort at non-tagging localities, increases the probability that sedentary patterns will be observed . Other telemetry information suggests that some razorback suckers were sedentary while others showed some movement (McAda -and Wydoski 1980, Osmundson and Kaeding 1989a). Three razorback suckers radiotagged in autumn moved short distances but only within the Walker Wildlife Area gravel pit (McAda and Wydoski 1980). Diel movements of one fish were greatest in late evening and late morning, and fish did not school. Three razorback 32