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<br />A noaulation of humpback chubs may exist in the Colorado River <br />in Cataract Canyon bas~.c1 un the capture ot" adults, and Possible <br />juveniles and age-O specimens there (Valdez et a1 1936)• Swift <br />water and dangerous rapids have limited sampling of the canyon. <br />Similarly, the Yampa River may hold an undiscovered population in <br />Cross Mountain Canyon in Colorado (Wick et a1. I98i), an area <br />that is difficult to access (Torres et al 1978). <br />Range of Reproduction <br />Reproducing populations of humpback chubs occurs in the Little <br />Colorado River (Kaeding and Zimmerman 1983), Black Rocks, and <br />Westwater Canyon (Valdez et a1. 1982). Reproduction may also <br />occur in areas where the pop~vlation status of humpback chub <br />existence is less certain. These include Cataract Canyon (Valdez <br />et a1. 1986); the Green River in Desolation and Gray canyons <br />(Holden and Stalnaker 1975b, Holden 1978), and the lower Yampa River <br />(Wick et a1. 1981). <br />Habitat Use <br />Habitat-use information for humpback chub comes mainly from <br />three areas: Westwater Canyon, Black Rocks, and the Little Colorado <br />River. Key similarities between these widely separated areas may be <br />the F~reset~ce of rock substrates that form complex micro-habitats <br />th~~t include Pockets of quiet water or eddies (L. Kaeding, IlSFWS, <br />pers comm.), and the availability of deep swift water (Valdez and <br />Clcmmcr IJf12) . <br />6 <br />