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<br />Gila <br /> <br />The Humpback Chub, <br />cypha, in the Grand Canyon Area of the <br />Colorado River <br /> <br />ROYAL D. SUTTKUS <br />GLENN H. CLEMMER <br /> <br />ABSTRACT <br /> <br />The humpback chub, Gila cypha, is redefined from specimens taken in the <br />Colorado River in the Grand Canyon. Specimens from 24.6 - 320 mm are de- <br />picted, and notes on growth and development, sexual dimorphism, breeding <br />tubercles and coloration, and reproduction are presented with standard meristic <br />and morphometric data. <br /> <br />Editorial Committee for this paper: Dr. James E. Deacon, University of <br />Nevada at Las Vegas, Las Vegas, NV 89109. <br /> <br />Dr. James D. Williams, Office of Endangered Species, Fish and Wildlife Service, <br />Washington, D.C. 20240. <br />