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in Yampa Canyon in Dinosaur National Park. Table 3 provides a summary of the relative abundance of the fishes they collected, with identification of species native to the upper Colorado River basin. Distribution, trends in abundance, and historical background of each species were discussed. Habi- tat preferences and reproductive success were discussed for selected species as were reasons for declines of native species. Using much of the same data, Holden and Stalnaker (1975b) reported an fish collected by electro- fishing, gill nets, and seines from Craig to the mouth of the Yampa River between 1968 and 1971. Relative abundance of fishes collected at specific sites is included in Table 3. Squawfish collections were related to water temperature and turbidity; squawfish seemed to move into the Yampa River from the Green River as waters cleared and warmed in July and August, presumably to spawn. The walleye (Stizostedion vitreum), bluegills (Le orris macrochirus), and largemouth bass (Micropterus salmoides) collected were considered "wanderers" from reservoirs on the upper Green River system. Red shiners, creek chubs, mottled sculpins and hybrid suckers reported from the Yampa by Holden and Stalnaker in their 1975a paper were not. reported in their 1975b paper. Kidd's (1975) Table II on the Yampa River is apparently from Holden's (1973) doctoral dissertation, and his data were essentially those reported by Holden and Stalnaker. The Final Environmental Impact Statement on the Yampa Project (U.S. Dept. of Agriculture, Rural Electrification Administration 1974) contained information on the discharge patterns of the Yampa River near Maybell, quality of Yampa River water, and benthic fauna and fishes collected near Craig. Bottom fauna was dominated in weight and numbers by immature insects; may- flies and caddisflies were most abundant. Immature stoneflies, true flies 16