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<br />," 0-" <br /> <br />4.2 Hypothesis-Testing Studies <br /> <br />Studv #7. Availabilitv habitat. characteristics. and fish use of sprinQ <br />habitats for Colorado sQuawfish and razorback sucker in the Green River. <br /> <br />Description of work <br />An ongoing Service study that was originally conceived as a two-part <br />study involving habitat management for Colorado squawfish and <br />razorback sucker in the Green River. At present only the initial <br />part of the study will be -implemented (Subproject A: Habitat <br />Restoration and Management of Wetlands). The primary objective of <br />study will be to determine relationships among habitat availability <br />and habitat accessibil ity and use by fish in seasonally flooded <br />bottoms in the upper Green River. Old Charley Wash will be used in <br />this study to examine what role riparian habitats flooded during <br />spring runoff play in the reproduction and/or recruitment of <br />razorback sucker and Colorado squawfish and effects of predation by <br />nonnative fishes on native fishes. <br /> <br />Methods <br />Seasonally flooded areas are being located and inventoried in 1991 <br />and 1992 an environmental assessment and permits for development <br />work are also being written. During 1993 patterns of fish movement <br />in flooded areas will be evaluated using electrofishing and netting <br />techniques. In addition, some radiotelemetry work may be conducted <br />in conjunction with contaminant studies being conducted on the Green <br />River. In situ field experiments in flooded bottomlands will be <br />conducted during 1993 to evaluate growth, recruitment, predation, <br />and non-native fish interactions <br /> <br />Rationale <br />This study is important for determining if flooded bottomlands <br />created by a hydrograph exhibiting high spring flows are important <br />to razorback sucker and Colorado squawfish. <br /> <br />Deliverables <br />An annual report detailing habitat management options and flow <br />recommendations for optimizing habitat for endangered fishes will be <br />submitted by the end of the fiscal year. <br /> <br />1993 BudQet <br />-Labor $35,000 <br />-Equipment 2,000 <br /> <br />-Total ~37.000 <br /> <br />Flaming Gorge Studies <br /> <br />26 <br />