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-33- The last four species were not taken by the Wyoming Game and Fish per- sonnel. They were reported to have been taken by Utah Fish and Game work- ing in the study area, and consequently would be included in the species composition. Bigmouth Sucker - Catostomus latipinnis discobolus) This sucker is probably the most uniformly distributed large sucker in the study area. It was taken by every fish collecting method used during the study, and practically every gill net set or shocking operation produced a number of specimens. It accounted for 48.5% of the number of fish taken in the gill net sets and 51.4% of the total weight of these fish. The largest specimen taken was 20 1/4 inches long and weighed 2 7/8 pounds. Bonytail - (Gila robusta robusta) The bonytail is distributed throughout the study area. Concentrations are confined, for the most part, to the Green River proper. These fish seem to pre- fer the moderate to slow stream flows, and sand-silt bottom conditions existing in the lower section of the river from Big Island downstream. There appears to be a change in the physical characteristics of this fish in the extreme lower section of the study area, from Flaming Gorge downstream. Many of the fish taken in this section of the Green River had a very pronounced humpback. In one gill net set made in this area, the incidence of humpback ran over 66% of the total bonytails taken. In the photograph below the bottom five fish are bonytails displaying this charactristic. These fish have been con- sidered as possibly a sub-species by some writers. However, no attempt will be made to do so in this report. Humpback Bonytail - Green River (Bottom Five Fish)