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r ~ r F ~ ~:~ _. ... .~. ~ ~.3 Chubs were also encountered during monitoring, including: 1 humpback chub, 17 roundtail chubs and 3 unidentified chubs (Table 3). The lone humpback chub was caught in the Reach 1 in 1992. Roundtaii chubs were captured/observed in all reaches (including the 1994 elective reach). However, they were most numerous in 1990 (n=8) and 1994 (n=6). Roundtails ranged from 216 mm to 355 mm with mean length 310 mm (n=10). Eight species of introduced game fish were encountered during surveys (Table 4}. Smallmouth bass (n=177) were the most numerous showing greater than afive-fold increase in occurrence over the previous reporting period. Smallmouth bass were encountered almost exclusively in Reach 3, specifically in proximity to the Duchesne River, where a smallmouth bass fishery has established over the past several decades. Northern pike showed a 25% decline in numbers over the preceding 4 years (n=+106 vs n=142), but were the second most common game fish encountered. They were found predominantly in Reaches 1 and 2, although high numbers were encountered in Reach 3 during 1990 and 1991. Pike were most commonly found in eddies, flooded vegetation and flooded tributary mouths where they congregated to spawn. Channel catfish (n=23), brown trout (n=15), walleye (n=14) and rainbow trout (n=10) were widespread and too limited in numbers to allow reasonable comment. Catfish and walleye were found primarily in Reaches 2 and 3. Although found in all reaches, rainbow and brown trout were encountered primarily in the Reaches 1 and 2. Green sunfish (n =13) were associated primarily with Ouray National Wildlife Refuge, as was the 1 black crappie encountered. Fish counts conducted in the first mile of each subreach in 1994 indicated that flannelmouth sucker was the most numerous and widely distributed fish. in the upper green river (Figure 7). As many as 72 fish were counted in a one-mile stretch and 35 of 36 stretches contained flanneimouth suckers. Flannelmouth sucker densities were highest directly below Split Mountain and showed a generally decreasing trend down river (Figure 8). Carp were nearly as numerous and densely populated as fiannelmouth suckers. They, too, were present in all but 1 subreach. However, carp appeared to be least •numerous where ~ flannelmouth suckers were most numerous, showing a general increase in density further down river. Bluehead suckers were found almost exclusively in the Reaches 1 and 2, where they were more numerous than carp above RM 307. Channel catfish did not show great density, but were found consistently throughout the standardized reaches. From these data, it appears that the fish densities were highest in Island Park and from Split Mountain ~to the Ouray National Wildlife Refuge. Fish counts in the White River indicated flannelmouth suckers were the most numerous fish present. Unlike the Green River, carp numbers were less than half flannelmouth numbers. Bluehead suckers and channel catfish were mostly absent from the White River. No other species were counted in numbers high enough to warrant analysis. 16