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C. Gila cypha (humpback chub) <br />1. Original Distribution - The humpback chub was first "dis- <br />covered" in 1946 in the turbulent waters of the Colorado <br />River within the Grand Canyon (Miller, 1946). At the time <br />it was believed the fish was limited to the Grand Canyon <br />stretch of the Colorado River, and as late as 1965 fewer <br />than a dozen specimens had been placed in museums. During <br />the period 1960-1975 several reports extended the range <br />upstream in the Colorado River and several of its larger <br />tributaries (Green, White and Yampa rivers). Holden and <br />Stalnaker (1970) found abundant hybridizing between G. cypha <br />and Gila elegans (bonytail chub) throughout the range and <br />believed both species to be one complex species. Most <br />authorities do not agree with this, but rather believe the <br />man-made alterations of the Colorado River have broken down <br />isolating mechanisms of the species, allowing them to hybri- <br />dize. <br />17 <br />fit;.. 't .. ...,?'?i?X! `7?'+?L€i?? 1a. .;. ?-. ??t?i?.• ? - ? .,. :. ? ..i S ? ?A.a *t; .?: r. ? ..