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In LD3 in 1994 to 1996, seven native and eight introduced species and four hybrid suckers were captured by electrofishing. Flannelmouth sucker, brown trout, bluehead sucker, common carp, and mountain whitefish were the most common species collected, and represented 88% of the total assemblage. Native species represented 56% of all fish captured, by number. The most upstream captures of red shiner in Lodore Canyon were in this reach. In LD3 in the 2002 to 2004 period, seven native and ten introduced species and three hybrids were captured by electrofishing. Brown trout, flannelmouth sucker, bluehead sucker, common carp, and channel catfish were the five most common species, and made up 81% of the fish community. Native fishes were 39% of the total, by number. In LD4 in 1994 to 1996, eight native and 11 introduced species and five hybrids were captured by electrofishing. Flannelmouth sucker, bluehead sucker, common carp, brown trout, and red shiner were the most numerically abundant species collected, and represented 87% of the total assemblage. Native species represented 63% of all fishes captured, by number. The only razorback sucker captured in the 1994 to 1996 survey came from LD4. First captures of northern pike Esox lucius and higher abundance of channel catfish were also notable in the 1994 to 1996 period. In LD4 in the 2002 to 2004 period, seven native and twelve introduced species and six hybrids were captured by electrofishing. Flannelmouth sucker, common carp, channel catfish, bluehead sucker were the four most common species, smallmouth bass and brown trout were tied for the fifth most common species, and together made up 82% of the fish community. Capture of relatively large numbers of smallmouth bass and the relatively low numbers of brown trout were notable. Native fishes were 42% of the total, by number. In reach WH 1 in 2002 to 2004, nine native and 12 introduced species and five hybrids were captured by electrofishing. Flannelmouth sucker, bluehead sucker, channel catfish, smallmouth bass, and common carp were the five most common species collected and represented 86% of the total assemblage. Native species represented 57% of all fishes captured. In reach WH2 in 2002 to 2004, nine native and 12 introduced species and five hybrids were captured by electrofishing. Bluehead sucker, flannelmouth sucker, smallmouth bass, channel catfish, and common carp were the five most common species collected in descending 22