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National Monument), a result of outwash and scouring from Split Mountain Canyon. Side channels and backwaters were the most common habitats in this reach, but riffle habitat, if found, was at the upper end. The drainage area was dominated by agriculture in the Uintah Basin and by the city of Vernal, Utah. Distribution and relative abundance of all fish species Fish representing nine families and 26 species were collected from the Green River 1979 to 1981. Relative to the Colorado River basin, these included nine native (six endemic) and 17 exotic (introduced) fish species. In addition, five hybrids were collected during this investigation. Red shiner, channel catfish, and carp were the most common and most widely distributed of the introduced species. They were found in all strata and usually were the most common species in collections (Table 7). Carp were slightly less abundant in stratum C than in the other strata, probably a reflection of habitat availability. Channel catfish were collected in fewer numbers from stratum F than the other strata. Red shiner was undoubtedly the most common species in the Green River and abundant in all strata. The fathead minnow and black bullhead are also distributed through- out the study area, but generally occur in fewer numbers than the above mentioned species. However, fathead minnows were considered abundant in strata B and E. Green sunfish and smallmouth bass were found in limited numbers in most strata, but were most common in strata E and F near the mouth of the Duchesne River. Smallmouth bass were stocked in the Duchesne River in the 1960's and have apparently moved downstream into the Green River. The smallmouth bass appear to be reproducing in the Green River since several size classes of fish were collected. Introduced species that were occasionally collected include white sucker, creek chub, redside shiner, sand shiner, Utah chub, northern pike, walleye, brown trout, cutthroat trout, and rainbow trout. Redside shiner and sand shiner were consistently collected only in a few widely scattered locations. Walleye were collected mainly near the mouth of the Duchesne River (they were originally introduced in the Duchesne River system). The remaining species were collected in very low numbers. Several of these species are represented by only one or two individuals. Flannelmouth sucker was the most abundant native fish species collected, followed in abundance by bluehead sucker. Both species were collected in all strata. However, the bluehead sucker was considered rare in strata A and B. The bluehead sucker prefers rubble or gravel substrate and was most common where that substrate was available (C and D). The speckled dace was collected in small numbers in all strata. Mottled sculpin were only collected in the upper portion of stratum F, which appears to be lower limits of its distribution in the main stem Green River. 27