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a <br />three sucker hybrids was detected. Fathead minnow, redside shiner, white sucker, mountain <br />whitefish, and flannelmouth sucker made up 94% of the fish community. Native species <br />represented 21 % of the fish community. Notable captures in this reach included a near-dead <br />hatchery-origin bonytail that was stocked in autumn 2002 six days before sampling took place <br />and 0.4 RK upstream. We also documented upstream dispersal of red shiner in the Green River <br />between April and September 2003 sampling periods, which is discussed more fully in a later <br />section. <br />In the 1994 to 1996 period, the fish assemblage of Lodore Canyon differed from that <br />found in upstream Browns Park and also varied along the longitudinal gradient of reaches LD 1 <br />to LD4. In LD1, four native and five introduced species and three hybrids were captured by <br />seining. Flannelmouth sucker, bluehead sucker, white sucker, redside shiner and fathead <br />minnow were the most common species collected, representing 94% of the total assemblage <br />structure and native fishes were 70.9% of those captured. Notable in reach LD I and downstream <br />reaches in the 2002 to 2004 period were severe reductions in the abundance of native fishes and <br />increased diversity and abundance of non-native fishes, particularly red shiner and sand shiner. <br />In LD 1 in the 2002 to 2004 period, six native and ten introduced species and two hybrids were <br />detected by seining. Fathead minnow, redside shiner, flannelmouth sucker, white sucker, and <br />red shiner were the most common species collected, representing 94% of the total assemblage <br />and numerically, native fishes were 19.4% of those captured. <br />In LD2 in 1994 to 1996, seining captured five native and 11 introduced species, and two <br />hybrids. Speckled dace, flannelmouth sucker, bluehead sucker, white sucker, and redside shiner <br />were the most common species collected, representing 98% of the total fish community and <br />native species represented 94% of all fish captured. Notable finds were roundtail chub and <br />smallmouth bass. In LD2 in the 2002 to 2004 period, six native and ten introduced species and <br />two hybrids were detected by seining. The fish community of LD2 showed a distinct "break" or <br />transition from an upstream cool water assemblage to a more warm water one downstream, as <br />red shiner were present in relatively large numbers. There was no corresponding abrupt shift in <br />water temperature. In 1994 to 1996 this break was in downstream reach LD4. Fathead minnow, <br />24