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~- )4 texanus (Abbott). The two members ot the family Iotaluridae were ohannel catfish Ictalurus ~ctatus (R&t1nesque), and blaok bullheads Ictalurus _las (Rafinesque). Single representatives of the families Cottidae and Centrarcbidae were mttled scu1pins Cottus bairdi (Girard), am green sunfish Lepom1s clanellus Rafine8que) respectively. Yountain whitefish Pro60pium williamson! (Girard), rainbow trout Salmo Il';airdneri H.1ohardson, brown trout Sumo trutta Linnaeus, and yellow walleyes Stizostedion vitreum Olitchill) have been colleoted from the Green River in or near the thesis area by soma investigators (McDonald am Dotson, 19~; Bosley, 1960; Gaufin, Smith, and Dotson, 1960; Azevedo, 1963), but were not oolleoted during this study. These fishes were all reported as being rare in the Green River. and in most cases were collected trom small tributary streams. Redside shiners, fathead minnous. carp, channel catfish, blaok bullheads. and green sunfish are not endelnic to the thesis area. Redside shiners, according to Simon (1946), were introducod into the Green River prior to 1942. lIcDonald and Dotson were tho first to report fathead minnows from the Green River. Several uere colleoted by them near F.l.aming Gorge in 1958. Channel catfish were introduced into the Green River in ~lyoI\dng about 19)0 (Simon. 1946) and into the Colorado River in Utah in 1939 (Popov and Low, 19~). i 1 Taxonomy All scientific and cOIllJlX)n names used are those aocepted by the Amerioan Fisheries Society (1960). No attempt at identification below the species level was made. Numerous bonytail chubs with physioal oharacteristios often intermediate between ill:!.! robusta robusta, ~