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1 <br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br />Laboratory (Colorado State University, and FWS). Problems with identification <br />of young chubs have precluded studies of habitat needs. <br />Bonytail chub: <br />Habitat requirements of bonytail chub in the Green River basin are <br />largely unknown. 'Fish collections in Echo Park (DNM) prior to and following <br />closure of Flaming Gore Dam indicate that bonytail chub were present in fair <br />numbers at the confluence of Yampa and Green rivers (Vanicek 1967). However, <br />more recent investigations in that area have yielded few individuals. Holden <br />and Stalnaker (1975) reported capt+ice o` '~a '.~nnytail chub in lower Yampa and <br />upper Green rivers between 1968-1970. Holden and Crist (1981) collected one <br />bonytail chub in lower Yampa River in 1979 and FWS captured one suspected <br />juvenile in 1987. Reintroduction of bonytail chub into upper Green River <br />(DNM) in 1988 is expected to provide some information on habitat use of this <br />rare species (USFWS 1987a). <br />Razorback sucker: <br />Adult and larval razorback sucker have been captured in flat-water <br />sections of upper Green River and lower Yampa River (Holden and Stalnaker <br />1975, McAda and Wydowski 1980, Tyus et al. 1982b, Tyus 1987). During the <br />nonbreeding season, adult razorback sucker were most common in shoreline runs <br />and near midchannel sand bars (average water depth < 2m, average velocity < <br />O.Sm/s) (Tyus 1987). Collections from 1974-1976 suggested that razorback <br />sucker may overwinter in Echo Park area of DNM (McAda and Wydowski 1980. <br />Captures of ripe fish on cobble/gravel bars and in flooded bottomlands in <br />spring/early summer suggests that this species uses a wide variety of spawning <br />28 <br />