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common from Hayden to the Green River, but since roundtail chubs were not <br />listed among the collected fishes, an erroneous identification is suspected, <br />Few carp, channel catfish, rainbow trout-and brown trout were collected. <br />Creek chubs (Semotilus atromaculatus), black bullheads, cutthroat trout and <br />green sunfish (Le orris cyanellus) were rarely collected. <br />Banks (1964) surveyed fish distribution within Dinosaur National <br />Monument in 1961 and 1962; virtually the same data were preliminarily <br />summarized by Hagen and Banks (1963). Yampa River data (from Echo Park and <br />Castle Park sites) showed speckled dace, bonytail (and/or humpback and <br />roundtail?) chubs and flannelmouth suckers were most frequently collected. <br />Redside shiners, fathead minnows, bluehead suckers, channel catfish, mottled <br />sculpins, carp, Colorado squawfish, and green sunfish were also collected. <br />Stream flow, temperature and turbidity were considered influences <br />upon fish distribution in the Yampa and Green Rivers. Habitats in which <br />various fishes were caught and fish food habits were also discussed by <br />Banks (1964). <br />Holden"s work on fishes of the upper Colorado River basin led to <br />clarification of species of cyprinids of the chub genus Gila (Holden and <br />Stalnaker 1970). Suttkus and Clemmer (1977) subsequently redefined Gila <br />cypha (humpback chub) from specimens collected in Grand Canyon and discussed <br />differences between that species and G. robusta (roundtail chub) and G. <br />ele ans (bonytail). <br />In 1975, Holden and Stalnaker published two reports on fish distri- <br />bution which pertained, in part, to the Yampa River> Holden and Stalnaker <br />(1975a) studied fishes of the Yampa River as part of a 1968 to 1973 study <br />at an upper station from Craig to Juniper Springs, Colorado, and a lower one <br />15 <br />