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captured. Notable finds were roundtail chub and smallmouth bass. In reach 3, four native and three introduced species were detected by seine sampling. Flannelmouth sucker, speckled dace, bluehead sucker, white sucker, and mottled sculpin were the most common species collected, representing 98.5 % of the total f sh community and native species represented 94 % of all fish captured. In downstream reach 4, five native and eight introduced species and two hybrid combinations were detected by seine sampling. The fish community of reach 4 showed a distinct "break" and shifted to mostly warm water species compared to upstream reaches. Red shiner, fathead minnow, redside shiner, speckled dace, and flannelmouth sucker were the most common species collected, representing 88 % of the total fish community and only 16.8% of all fishes captured were native. The appearance and abundance of red and sand shiners was notable. In the Island and Rainbow parks reach of the Green River, seven native and 11 introduced species and two hybrid combinations were detected by seine sampling. Non-indigenous taxa represented 98.2 % of all fishes captured; most were tolerant of warm water. Red shiner was the dominant fish species and, when combined with fathead minnow, sand shiner, redside shiner, and flannelmouth sucker, comprised 97 % of the fish community. Notable was a single juvenile Colorado pikeminnow about 150 mm TL (released), a juvenile northern pike (112 mm TL), largemouth bass Micropterus salmoides, and green sunfish. A total of six native and nine introduced fishes were captured in the Yampa River. Similar to the Green River in the Island and Rainbow parks reach, introduced species dominated and represented 94.6 % of all fishes captured. Red shiner, sand shiner, fathead minnow, bluehead sucker, and speckled dace were the most abundant species and represented 96 % of the fish community. Notable among native fish captured were 18 Colorado pikeminnow that ranged in length from 13 to 23 mm TL. Longitudinal changes in the Lodore Canyon fish community, electrofishing samples.-- Similar to seine sampling, electrofishing captures of mostly large-bodied fishes in Lodore Canyon suggested that the upstream fish community was relatively species-poor and taxa were cold- or cool-water tolerant (Fig. 5, Table 4). In downstream reaches, we found more species 18