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<br />Table 1. Characteristics used to separate humpback chub and roundtail chub (adapted from <br />Douglas et al. 1989 and Muth 1990). <br /> <br />Roundtail chub <br /> <br />Humpback chub <br /> <br />Angle of anal fin base extends onto the <br />middle of the caudal fin. <br /> <br />Angle of anal fin extends well up on the <br />upper lobe of the caudal fin. <br /> <br />9 or fewer anal fin rays. <br /> <br />10 or more anal fin rays. <br /> <br />Caudal peduncle thick. <br /> <br />Caudal peduncle narrow. <br /> <br />Head rounded and large. <br /> <br />Head small, depressed (concave) <br /> <br />Terminal mouth <br /> <br />Subterminal mouth. <br /> <br />Mouth even with snout. <br /> <br />Mouth overhung by fleshy snout. <br /> <br />Fins more rounded or squared. <br /> <br />Fins falcate (sickle shaped) <br /> <br />20 <br />