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Species Associations Humpback chub were captured in association with 18 fish species, including 7 native and 11 non-native forms (Table 2). Species dominating the catch included native roundtail chub (2.1 fish/h angling and 10.5 fish/h electrofishing), flannelmouth sucker Catostomus latipinnis (21.1 fish/h electrofishing), and bluehead sucker C. discobolus (30.7 fish/h electrofishing), and non-native channel catfish Ictalurus punctatus (3.3 fish/h angling and 19.6 fish/h electrofishing) and common carp (24.7 fish/h electrofishing). Incidental species were native Colorado squawfish Ptvchocheilus lucius, razorback sucker Xyrauchen texanus, mountain whitefish Prosopium williamsoni, and sculpins Cottus species, and non- native black bullhead I. melas, northern pike Esox lucius, white sucker C. commersoni, green sunfish Lepomis cyanella, smallmouth bass Microaterus dolomeui, and four species of trout (Oncorhynchus m kiss, 0. clarki, Salmo trutta, and Salvelinus namaycush; Table 2). In large eddies yielding humpback chub by angling, roundtail chub comprised about 45% (N=159), channel catfish about 35% (N=121), and humpback chub about 15% (N=51) of the catch. Other species (including Colorado squawfish, flannelmouth sucker, common carp, black bullhead and trout) composed less than 5% of the angling catch. Electrofishing catch was dominated by the 2 suckers, roundtail chub, channel catfish and common carp. Except for the roundtail chub, these fishes were common in all three canyons (Table 2). Roundtail chub (N=1,482) were most abundant in Yampa Canyon but also occurred in Whirlpool Canyon (at least 3 times more fish were captured in Yampa Canyon than in Whirlpool Canyon; Table 2). No roundtail chubs were 10