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<br />Tnis r9port details a preliminary electrophoretic study of the <br /> <br />Colorado River Gila complex, as a step to answering the fol- <br /> <br />10Hing: <br /> <br />1. Are the three described species also biological ones? <br /> <br />2. Are species hybridizing or is variation in body shape <br /> <br />influenced by other factors? <br /> <br />The feasibility of non-lethal sampling, a preferred criterion for <br /> <br />studies on endangered species, is examined using fin clips. <br /> <br />MATERIALS AND METHODS <br /> <br />Pieces of caudal fin were removed from 89 chubs caught by the <br /> <br />Utah Division of Wildlife Resources (UDWR) during the Summer 1935 <br /> <br />field season on the Green River. <br /> <br />Specimen numbers correspond to <br /> <br />those on live tags and reference photographs as assigned by UnWR <br /> <br />(Tab181). <br /> <br />All animals were returned alive to the river. <br /> <br />In <br /> <br />addition, samples Here obtain2d from 10 chubs caught by the <br /> <br />U.S. Fish and Wildlife Service at Black Rocks, Colorado (Tab12 <br /> <br />1). In this case, specimen numbers correspond to tag numbers <br /> <br />assigned by USFWS. <br /> <br />Each fin clip was placed in its own labelled <br /> <br />container and kept on dry ice before transfer to a -80 Oc <br /> <br />freezer. <br /> <br />Green River samples were kept by UDWR for several weeks <br /> <br />3 <br />