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<br />immature life stages of both native and nonnative fishes. Although large numbers of <br />nonnative fish are produced and exist in wetlands, management to enhance floodplain <br />habitat may increase the growth and survival of early life stages of razorback sucker. <br /> <br />RECOMMENDATIONS <br /> <br />1. Flow patterns characteristic of the natural hydrograph of the middle Green River <br />appear to serve as a cue to the concentration of razorback sucker at the primary <br />spawning (Escalante) site and should be maintained to concentrate spawning adults, <br />both spatially and temporally. <br /> <br />2. Because several individual razorback sucker were located on both the Escalante <br />and Yampa River spawning sites during the spawning period, it is recommended that <br />the fish in the Green River subbasin above Desolation Canyon be considered a single <br />population (Le. middle Green River population), as suggested by the RIP genetics <br />guidelines. <br /> <br />3. Evidence supports the concept that floodplain habitat is beneficial as nursery habitat <br />for early life stages and postspawning adult razorback sucker. At the same time, the <br />large number of nonnative fishes using and produced in depression wetlands causes <br />concern about the long-term management of this habitat. Information needs to be <br />gained regarding the impact of nonnative fish production in depression and terrace <br />floodplains on the survival and recovery of listed and other native fishes. <br /> <br />31 <br />