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18 adult razorback suckers were found during the study but no bony tail or humpback chubs were collected. A number of fish were rarely caught; creek chub (Semotilus atromaculatus), mountain sucker (Pantosteus platyrhynchus), white sucker, mottled sculpin (Cottus baird;), green sunfish, and smallmouth bass made up only 0.06% of the total catch. Successful reproduction of a species in a river section is evi- denced by the collection of young-of-the-year. Carp young were found in June; speckled dace, bluehead suckers, and flannelmouth suckers were found in July; Colorado squawfish, roundtail chub (Gila robusta), fat- head minnows, and red shiner young were found in August; and channel catfish young were found in September. T~is sequence generally indi- cates the spawning succession, with capture of young generally occurring about a month after spawning. Young were not found for half of the species collected, including creek chub, redside shiner (Richardsonius balteatus), razorback sucker, mountain sucker, white sucker, mottled sculpin, green sunfish, smallmouth bass, and walleye. Catch rates of adult fish captured by electrofishing are shown in Table 3 by habitat type and month. Carp consistently had the highest catch rates and they were most abundant in backwaters. Catch rates for other species were consistently low. Riffles were very rare in the study area and were, therefore, sampled infrequently. Most fish were caught in backwaters or eddies, i.e., areas of slow current, in April, May, June, and July, whereas runs produced more fish in August and September. This trend was due to a decreased catch rate of carp, which were more common in slow areas, and an increased catch of flannelmouth I I I I I I I I I I I I I I I I I I I