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. 11 . rather scattered and only six were captured. Three of these fish were caught in a 3 mile section of river near Ouray, Utah. Young-of-the-year razorback suckers were tentatively identified on the basis of lateral line scales (80-88). Six were found in the middle portion of the study area (Table 2). The only two razorback adults seen during the study were also in this area. The chubs (Gila) of Desolation and Gray canyons are distinctly different from those collected near Jensen. Table 2 shows the decrease in chubs, especially young-of-the-year, in the middle portion of the study area. The Desolation and Gray canyons specimens seem to represent a population distinct from the one near Jensen. Dorsal-anal fin ray counts (9-9 and 9-10), a narrow caudal peduncle, an obvious nuchal hump in adults, a rather flat head, and a tendency for a subterminal mouth suggest the humpback chub, although the robustness of the fishes and the slightness of the nuchal humping suggest the roundtail chub (Gila robusta) (Appendix III). Until a more thorough analysis of these fishes is fin- ished, the Desolation-Gray canyons specimens will be referred to as hump- back chubs, except for one instance where the specimen appeared to be a bony tail chub, as mentioned below. One adult bony tail chub was collected in the upper portion of the study area (Table 2; Appendix III). A juvenile chub was caught in Deso- lation Canyon that had dorsal and anal fin ray counts of 10-10, and a less obvious nuchal hump and flattened head than other chub specimens from that area. These characteristics suggest the fish was a juvenile bonyta il ch ub . . . . . . . . . .