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Humpback chub life-cycle partitions were difficult to define because fish less than 200 mm TL cannot be differentiated from. the roundtail chub. As a result, nearly all criteria for humpback chub have been extrapolated from. observations of the adult size group and are predicated upon the assumption that all life-stages inhabit the same general vicinity. Until 1984 razorback sucker collections were primarily incidental to activi ties directed toward the other two species of more prominent concern because of their endangered species status. In 1984 a pilot project was carried out to locate and study razorback spawning activity in the upper Green River. Sensitive Reach Criteria The designation of tmportant river reaches for different phases of a fishes life-cycle assumes that certain river reaches offer unique physical conditions conducive to the cCJllpletion of that phase or pre- ferred by individuals in that phase. Also, since m.uch of the infor- mation we have on these fishes is capture data, many of the conclusions relative to important reaches or preferred habitats assume that fish abundance is due to habitat preference or the presence of necessary habitat constituents. Therefore, in establishing criteria that defined important reaches, catch statistics were most often utilized which differentiated reaches by a higher catch rate than the rest of the river system. An exception has been the designations derived from. direct observations of fishes tracked by radio, primarily in the delineation of spawning areas. 9