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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 exotics 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-A, 36-0, 41) are found in varying distribu- tion patterns throughout the major tributaries. TABLE 2. Zoological and common names of fishes in the Upper Colorado River Basin Species Common Name Dorosoma petenense area fin shad Oncorh nchus kisutch Coosamon Oncorhynchus nerka Kokanee Proso i um wi l l i amso ni Mountain whitefish Salmo clarki Cutthroat trout Salmo clarki pleuriticus Colo. cutthroat trout Salmo clarki stomias Greenback cut roat trout Salmo gairdneri Rainbow trout Salmo trutta Brown trout Salvelinus fontinalis Brook trout Salveiinus namaycush - Lake trut Esox Lucius Northern pike C rinus car io Tarp Gila atraria Utah chub Gila cope Leatherside chub Gila cha Humpback chub Gila -ele9ans Bonytail chub Gila robusta Roundtail chub H by nathus hankinsoni Brassy minnow Species Common Name Spec i es Common Name Hybbo n athus pl aci tus Plains minnow Notro its lutrensis Red shiner Notropis stramineus Sand shiner PPii mmeeP-h-a-l es romel a s Fathead minnow P chocheilus lucius Colorado squawfish Rhinichthys cataractae Longnose dace Rhinichthys osculus Speckled dace Rhinichthys osculus thermal is Kendall Warm Springs dace Richardsonius balteatus Redslde sh1 ner Semolitus atromaculatus Creek chub Catostomus ardens Utah sucker Catostomus catostomus Longnose sucker Catostomus commersoni White s uc er Catostomus discobolus Bluehead sucker Catostomus latipinnis Flannelmouth sucker Catostomus platyrhynchus Mountain sucker Xyrauchen texanus Razorback sucker Ictalurus reel as Black bullhead Ictalurus natalis Yellow u lRead Ictalurus unctat?us Channel catfi=ski Fundulus zebrinus Rio Grande kill i i sh Fundulus sciadicus Plains topminnow Gambusia affinis oM quitofi sh Morone chrysops Wei to bass Morone saxatilis Striped bass Le omis cyanellus Green sunfish Lepomis macrochirus Bluegil Micro terus dolomieui ma mouth bass Micropterus salmoides Largemouth bass Pomoxis annularis White crappie - Pomoxis nigromaculatus Black crappie Etheostoma exile Iowa darter Etheostoma nigrum Johnny darter Perca flavescens Yel 1 ow perch Stizostedion vitreum Walleye Cottus bairdi Moftl eUscuTpi n 15