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the Upper Colorado River Basin (one additional threatened species is exotic to the basin). Joseph et aL (1977) listed 27 exotic, 14 native, 8 endemic, 4 threatened, and 2 endangered fishes. The largest discrepancy in these two treatments is in the number of exotic, threatened, and endangered fishes. Some recently-discovered exo~cs have been included in this paper, but the greatest difference probably occurs because of inclusion of reservoir fishes. Differences in numbers of threatened and en- dangered fishes have resulted from changes in federal and state listings. A total of 10 hybrid fishes have been reported in recent years from the Upper Colorado River Basin (Table 6). No effort was made to validate the iden- tification of these fishes. Exotic Fishes Fifteen exotic fishes were probably introduced in- to the Upper Colorado River Basin through pond and reservoir stocking. Seven of these are restricted to reservoirs (Figs. 2, 3, 4, 11-0, 32, 36. 43-0). Nine are common to abundant in reservoirs (Figs. 2, 4, 32, 36, 37, 38, 40, 42, 45). The remainder (Figs. 3, 11-~, 36-0, 41) are found i.n var!ing d~stribu- tion patterns throughout the major trIbutarIes. TABLE 2. Zoological and common names of fishes in the Upper Colorado River Basin Stet i es otTlllon Name Species Common Name Spec i es COlnl'OOn Name Dorosoma petenense Threadfin shad Oncorhynchus kisutch Coho salmon Oncorhynchus nerka Kokanee - Prosopium williamsoni Mountain whitefish Sa 1100 c 1 ark i Cutthroat trout SallOO,clarki pleuriticus Colo. cutthroat trout Salmo clarki stomias Greenback cutthroat trout Salmo gairdneri Ra i nbow trout Salmo trutta Brown trout Salvelinus fontinalis Brook trout Salvelinus namaycush lake trout Esox 1 uc ius Northern pike c~prinus carpio arp Gila atraria Utah chub Gila copei Leatherside chub Gila ~ HumpDaCl< chub Gila'eleTans BOnytai chub Gila robusta Roundtai 1 chub Hybognathus hankinsoni Brassy minnow Hybo~nathus placitus Plalns minnow Notropis lutrensis Red shiner Notropis stramineus Sand shiner Pimehhal es promelas Fat ead minnow Ptychocheilus lucius Colorado squawfish Rhinichthys cataractae Longnose dace Rhinichthys osculus Speckled dace Rhinichthys osculus thennal is Kendall Warm Springs dace Richardsonius balteatus Re ds i de s hi ne r Semolitus atromaculatus Creek chub Catostomus ardens Utah sucker Catostomus catostomus Longnose sucker Catostomus commersoni White sucker Catostomus discobolus Bluehead sucker Catostomus latipinnis Flannelmouth sucker Catostomus platyrhynchus Mountai n sucker Xyrauchen texanus Razorback sucker Ictalurus melas Bl ack bull head Ictaluru~ natalis Yellow bullhead Ictalurus punctatus Channel catfish Fundulus zebrinus Rio Grande killifish Fundulus sciadicus Plains topminnow Gambusia affinis Mosquitofish ~Iorone chrysops Wh ite bas s Marone saxati 1 is Striped bass Lepomis cyanellus Green sunfish Lepomis macrochirus Bl uegi 11 Mi cropterus dolomieui Smallmouth bass Micropterus salmoides Largemouth bass Pomoxis annularis White crappie Pomoxis nigromaculatus Black crappie Etheostoma exil e Iowa darter Etheostoma nigrum Johnny darter Perca fl avescens Yell ow perch Stizostedion vitreum Walleye Cottus bai rdi Mottled sculpin 15