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_Z~_ o!'total fish collected in the river. The total length range for all :~ountain suckers collected was 2.1 to 1b.2 inches. Fingerling bluehead ~,ountain suckers were often found with young flannelmouth suckers. Most o; the tributary streams that support trout contained the mountain sucker. The bluehead mountain sucker is one of the most important source of food for lake trout occurring in the lakes of the upper Green River drain- age (Simon, 194b). Koster states that this sucker is a good bait and forage fish. An interesting fact is that it feeds as readily upside down as when upright on algae attached to the underside of large boulders. W^apback sucker Xyrauchen texanus (Abbott} The humpback sucker is a species indigenous to the Colorado River drainage. It is reported to be abundant in the lower Colorado River, aa.^.ely in Lakes Mead and A~onave, but only a few adults have been taken fro^; the Green River in Wyoming (Simon, 191+6). One himmpback sucker, collected during the simuner of 1959 from the Green River in Utah near Hideout Forest Camp, was 19.2 inches in length and weighed 2.2 pounds. The grotesque hump on its back, formed by the interneural bones, readily separates this species from other suckers. n11 indications are that the humpback sucker is becoming rare in the green River. The period of spawning activity for humpback suckers in Lake Mead ~s between the 1st of riarch and the 15th of April. The water tempera- :ures at this time of year were 54° F. to 65° F.The areas of spawning activity seemed widespread about gravel shores in water depths 2 to 15 `eet• Females were escorted by 2 to 15 males. Following the spawning act carp were seen to converge over the location and feed voraciously. ~ ~ onez and Summer, 1954) ^ytail chub Gila robusta Baird and Girard =wring the imrestigations, all variations of bonytail chubs were created as one species. Several morphological variations occur within ""~s species and available literature indicates that fishery taxonomists. are uncertain as to classification of these variations. xtensive collecting was conducted on the river from 7 miles below ~'e town of Green River, Wyoming to the Utah-Colorado state line, a 's''anGe of approxi^ately 120 miles. The bonytail chub constituted ~7.3 v°rce nt of all fish taken from this segment of the Green River. It was ~r~~,aril- -o.,- ,~ collected from the main channel, while a few samples of small •~~dils were taken alon the shoreline. The largest bonytail collected ,~'~ a total length of 16.6 inches and weighed 1.2 pounds. Not one bonytail s ~a~en from streams containing trout which may be due to water temper- `-``re and the rapidly moving small strea:.s.