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<br />27 <br /> <br />disease, competition, predation, and hybridization. Gradually declining flows <br />following peak spring runoff are desired. Year-round low flows aid growth of <br />channel catfish, a potential competitor and predator of humpback chub. <br /> <br />Bonvtai1 Chub <br /> <br />Because sa few bony tail chub were ca11ected in the wild, their summer behavior <br />and requirements are unknown. It is hypathesized that if the habitat and life <br />history requirements of squawfish and humpback chub are met, then the <br />remaining banytai1 chub will benefit. <br /> <br />Razorback Sucker <br /> <br />Recruitment failure of razorback suckers presumably occurs in late spring and <br />early summer. This failure was linked elsewhere with predation by introduced <br />fish (including common carp and channel catfish) and may be assaciated with <br />loss of flooded bottom1ands and lowered river temperatures. Lawer flows may <br />favor proliferation of potential predators. <br /> <br />Autumn and Winter <br /> <br />Colorada Souawfish <br /> <br />Low flows in late summer and autumn are correlated with availability of <br />nursery habitat, young fish abundance, and growth. Backwater habitat <br />(quantity and quality) in the upper Green River should be maximized through <br />regulating Flaming Gorge releases. Reregu1ation should, however, consider <br />tributary inflaws pravided by the Yampa River. Unusually high flows in the <br />late summer and autumn reduce availability of nursery habitat for young <br />Colorado squawfish. Stable winter flows reduce ice scouring of shoreline <br />habitats used by overwintering adults and young, and stable winter base flows <br />may reduce stress to the fish. <br /> <br />Humoback Chub <br /> <br />Habitat use and flow needs of the humpback chub during autumn and winter are <br />not well understood. Observations during low-flow periods noted that Gila <br />species were constrained to pools in dewatered rapids and other impounded <br />waters. Conditians favaring reproductian and growth of channel catfish should <br />be identified and avoided because of passib1e negative interactions between <br />these species. <br /> <br />Bonvtail Chub <br /> <br />Because so few bony tail chub were collected in the wild, their autumn/winter <br />behavior and requirements are unknawn. It is hypothesized that if the habitat <br />and life history requirements of squawfish and humpback chub are met, then the <br />remaining bony tail chub will benefit. <br />