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<br />River is one specimen reported by Jordan (1891) near Delta, Colorado. Recent <br /> <br />studies by Kidd (1974; 1977) during the early 1970's found no bony tail chubs <br /> <br />in either the Gunnison River or the Colorado River in Colorado. Kidd does <br /> <br />not consider the Gunnison River as historic habitat for the bony tail <br /> <br />chub. <br /> <br />(4) Proposed Threatened Razorback Sucker <br /> <br />The razorback sucker is proposed for threatened status by the Fish <br /> <br />I <br />il <br />, <br />" <br /> <br />and Wildlife Service and is classified as endangered by the State of Colorado. <br /> <br />Historically razorback suckers were collected from both the Gunnison and <br /> <br />~ <br />, <br />~ <br />~I <br /> <br />Uncompahgre Rivers near Delta (Hubbs and Miller, 1953). Kidd (1977) in <br /> <br />his fishery survey of the Gunnison River below Delta observed razorback <br /> <br />~: <br /> <br />suckers only in the lower reaches of the Gunnison near its confluence with <br /> <br />i' <br />~; <br />. <br /> <br />the Colorado River in Grand Junction. Holden (1977) collected no razorback <br /> <br /><,,', <br />f: <br />'~ <br /> <br />suckers in the Gunnison River below Delta. However, a razorback sucker <br /> <br />~~ <br />~~j <br />~,' <br />L <br /> <br />was taken by gi11net from the Gunnison River in 1975 near Delta (Wi1tzius, <br /> <br />1978). Kidd (1977) concluded that razorback suckers have declined on the <br /> <br />tti <br /> <br />;'.~; <br /> <br />Gunnison from relative abundance at the turn of the century to extreme rarity <br /> <br />during the last 70 years. <br /> <br />;'i <br />~1 <br />" <br />f:' <br /> <br />Adult razorback suckers generally tend to remain in eddies and <br /> <br />ji; <br />" <br />~" <br />.-;;' <br /> <br />II <br />iii <br />~; <br />1~ <br /> <br />backwaters lateral to the strongest currents. Spawning has been documented <br /> <br />over cobble bars and in riffles with current velocity of approximately 3 <br /> <br />fps (McAda and Seethaler, 1975) and along shorelines in reservoirs where <br /> <br />,.' <br />.", <br /> <br />adequate wave action is present (Douglas, 1952). Spawning takes place <br /> <br />when the temperature reaches from 580 to 680 f. This generally occurs in <br /> <br />the Gunnison River in June. The young-of-the-year probably move to the <br /> <br />shallow backwater areas where temperatures can range from 700 to 750F., <br /> <br />noticeably warmer than the adjacent river (Sigler and Miller, 1963). <br /> <br />14 <br />