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of squawfish development are also closely tied to some. specific habitat <br />requirements. It is imperative that proper flows and temperatures are <br />provided during these essential life stages. <br />FS~75 believes that adverse impacts to Colorado squawfish related to project <br />depletions can be offset by the implementation of certain conservation <br />measures. With the inclusion of measures specified in this biological <br />opinion, the SIUtif is not likely to jeopardize the continued existence of this <br />species. <br />Humpback chub <br />Humpback chub generally do not make migrational movements in the Upper <br />Colorado River and tend to reside throughout the year within a limited <br />stretch of river. Humpback chub are found inhabiting narrow, deep canyon <br />areas which are quite restricted in distribution. They seldom leave their <br />canyon habitat (Miller, et al, 198`L). While the humpback chub are still <br />occasionally found dispersed in the Green and Yampa Rivers, the only major <br />population of humpback chub conclusively known to exist in the Upper <br />Colorado River Basin are located in Black Rocks. and Westwater Canyons on the <br />Colorado River. In our opinion, the proposed project is not likely to <br />jeopardize the continued existence of the humpback chub, provided the <br />conservation measures outlined below are incorporated into the project plan. <br />Bonvtail chub <br />Little is known about the biological requirements of the bonytail chub, as <br />the species greatly declined in numbers in the upper basin shortly after <br />1960. Until recently, FWS considered the species extirpated from the upper <br />basin; however, a recently collected specimen which exhibits many bonytail <br />5 <br />