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<br />that humpback chub might be attempting to spawn in the Little Snake River. <br />Humpback chub were captured and telemetered in the Little Snake River between <br />May and July during their spawning period. Two humpback chub were captured <br />with secondary sexual characteristics such as spawning coloration and breeding <br />tubercles. Water temperatures in the Little Snake River were adequate for <br />spawning when humpback chub were present. Long-range movements of 32 and <br />39 km by two telemetered humpback chub in the Little Snake River were similar to <br />distances moved by spawning humpback chub in the Grand Canyon. Despite <br />considerable fidelity to local population centers, humpback chub are known to move <br />relatively long distances between populations groups or for spawning. Although <br />there is circumstantial evidence that support potential spawning of humpback chub <br />in the Little Snake River, currently there is no proof. No humpback chub have been <br />collected in ripe, spawning condition in the Little Snake River and all juveniles <br />collected there have been identified as congeneric roundtail chub. In addition, <br />confirmation through larval collections was not possible because there were not <br />adequate morphometric characteristics to distinguish small'arvae of Gila species. <br />Differentiation of small Gila species larvae may require genetic evaluation. <br /> <br />Our recommendations for the Instream Flow Work Plan focus on research <br />necessary to develop scientifically defensible flow recommendations. We <br />recommend: <br /> <br />1. Develop interim flow recommendations based on present knowledge. <br />2. Estimate Little Snake River flows and sediment loads necessary for creation <br />and maintenance of Colorado pikeminnow and razorback sucker nursery <br />habitats in the Green River. <br /> <br />VIII <br />