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River near Moab. Utah (Tabs et al. 1965; Holden and Stalnaker 1975) have failed to find any humpback chubs. Present distribution of the humpback chub includes (Figure 1): 1. The Green River in Desolation and Gray canyons (Holden and Stalnaker 1975; Holden 1977); 2. The Green River in Dinosaur National Monument (Miller 1954; Holden and Stalnaker 1975); 3. The Yampa River in Dinosaur National Monument (Miller 19b4; .Holden and Stalnaker 1975; Seethaler et al. 1976); 4. The Colorado River between Palisade, Colorado, and Black Rocks near the Colorado-Utah border (Kidd 1977); 5. The Colorado River is Marble and Grand Canyons from River Mile 27 to River Mile 108 (Suttkus et al. 197b; Suttkus and Clemmer 1977) and the Little Colorado River from its mouth to a point 13 ]cm upstream (C. Hinckley, personal communication). Distribution in all the areas listed above is sporadic, with con- centrations in very small parts of the canyon areas (Holden 1977; personal coErmuaication, C. Hinckley, Musewn of Northern Arizona). Reproduction of humpback chubs as evidenced by young-of-the-year or juvenile fish is recorded from Desolation sad Gray canyons (Holden and Stalnaker 1975; Holden 1977} and from the Grand Canyon near the Little Colorado River (Suttkus et al. 1976; Suttkus and Cleammer 1977: personal com<nunicatioa, C. Hinckley, Museum of Northern Arizona). The humpback chub has generally bees associated with fast currents and/or deep channels (Holden and Stalnaker 1975; Seethaler et a1. 1976; Kidd 1977). Holden (1977) studied preferred habitat of this species in Young-of-the-year and Desolation and Gray canyons in Sept~nber, 1977. juvenile chubs preferred habitats with little current, a silt substrate, and a depth of 0.3-1.0 m. Adults utilized a variety of areas, usually over a sand substrate, and showed little preference for either depth or velocity. Distributional information stresses the preference for canyon areas that contain deep, fast water, although microhabitat studies in- dicate that shallower, slower areas within these canyons are used during daily activities.