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<br />~ ".- <br /> <br /> <br /> <br />\ <br /> <br />/ <br /> <br /> <br /> <br />\ <br /> <br />\ <br /> <br /> <br />/ <br /> <br /> <br />\ <br /> <br />Gila robusta, roundtail chub <br />dorsal rays almost always 9 <br />anal rays about 90% 9, 10% 10 <br />head large, straight or conv~x on top <br />profile behind head slightly humped i,n large individuals <br />caudal peduncle always thick, the ratio ~f its minimum <br />depth divided into the length of the base of the <br />dorsal or anal fin ranges from 1.5 to 2.3 in the main <br />river, but higher in some places due to hybridization <br />and/or perbaps selection in the absence of the other <br />species. <br />fins small compared to the other species <br />gill rakers 12 to 15, usually 12 to 14 <br />number of vertebrae 40 to 43 <br />upper and lower jaws nearly equal <br />* Hybrids will be with humpback chubs, and will have smaller <br />heads and larger fins (with D and A more-likely 10), some <br />development of the hump, and slightly overhanging upper jaw. <br />