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d. Bonytail <br />The bonytail is the rarest native fish in the Colorado River. Formerly reported as <br />widespread and abundant in mainstem rivers, its populations have been greatly reduced. Of <br />this once abundant species, only a small number of old adult fish (i.e., ages 40 years or <br />more) still exist in Lake Mohave, perhaps other Lower Basin reservoirs, and rarely Upper <br />Basin rivers. The fishes were once common in Lake Mohave. <br />USFWS is designating 7 reaches of the Colorado River system (Figure I -2 -4) as critical <br />habitat for the bonytail. In the Upper Basin, critical habitat includes portions of the Green, <br />Yampa, and Colorado rivers. Portions of the Colorado River in the Lower Basin also is <br />being designated as critical habitat. Of the historical range of bonytail, 14 percent is being <br />designated as critical habitat. <br />Figure 1-2 -4. Map of Critical Habitat for the Bonytail. <br />I -9 <br />I� <br />I <br />I <br />NEVADA <br />i COLORADO <br />M�iEtt Y' <br />I <br />I <br />�MM IfAo <br />\• ' <br />ARIZONA <br />a+ <br />CALM <br />MEW <br />Ij MEXICO <br />wmllY <br />s.�.nx !� <br />I <br />YW <br />Figure 1-2 -4. Map of Critical Habitat for the Bonytail. <br />I -9 <br />