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two dJtferent migration dIstances wh~n extracted trom two fISh, then those individuals would not posess the same gene seque~ce coding for that protein and would be genetically-different. Electrophoresis has been used for stock determination in fish~s, especially among the salmonids (Utter et al. ~ 19T:;~ All endqrf et al., 1977) . I nasi tuat ion si mi 1 ar to the sympatry recorqed for Gila sp. in the Lipper Colorado River, genetic isolatiion as well as intergradation in darters of the Ozark Uplands h~ve been convincingly demonstrated using this technique (Wiseman let al., 1978). The data in most electrophoretic studies are in ~he form of differences in the frequency of allozymes, which enta~ls large sample sizes and usually the sacrifice of specimens. T~is protocol obviously cannot be part of an identification prog~am involving endangered fishes, most especially since it is often necessary to identify only one or a few individuals. Itiis also desirable, if not requisite, that identification pro~e- dures not entail the sacrifice of animals. MATERIALS AND METHODS Samplinq: Humpback and roundtail chubs were caught with 46.2 X 1.8 m trammel nets at Blackrocks Canyon, Colorado, 217.6 - 219.2 km from the confluence of the Green and Colorado Rive}s. BecausE.> of their legal statu~:;. as; well -as curr'ent use in tr-ack:\.ng studies, humpback chubs were not sacrificed. Instead, samPtes narcotized w~th were taken, below, from fish as described t ,.. ] L~, j n", m Co t h d ri D S U 1 P t-j d t c" . {~l] Sr'E'C j mE'f.,':' r pcc'j V.E'C! Car-]I r. tdgS -rnd F.