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a LIST OF FIGURES Figure Page 1. Map of Yampa River study area . . . . . . . . . . . . . . . . . . 3 2. Relative abundance of fish collected by electrofishing at upper intensive sites on the Yampa River in the spring, 1985 . . . . . . . . . . . . . . . . . . . . . . . 15 3. Relative abundance of fish collected by electrofishing at upper intensive sites on the Yampa River and trammel net in Yampa Canyon in the summer, 1985 . . . . . . . . . . . . . 18 4. Relative abundance of fish collected by electrofishing at upper intensive sites on the Yampa River in the fall, 1985 22 5. Length frequency of Colorado squawfish from the Yampa River, 1985 . . . . . . . . . . . . . . . . . . . . 23 6. Frequency of baseflow habitat utilization by squawfish on the upper Yampa River, 1979-1985 . . . . . . . . . . 29 7. Frequency of runoff flow habitat utilization by squawfish on the upper Yampa River, 1979-1985 . . . . . . . . . . 30 8. Frequency of habitat utilization by squawfish within Yampa Canyon on the Yampa River, 1979-1985 . . . . . . . . 32 9. Runoff and base flow habitat RMI 45 - 89 observed on the Yampa River during the 1985 habitat census. . . . . . . . . . 33 10. Runoff and base flow habitat RMI 90 - 121 observed on the Yampa River during the 1985 habitat census. . . . . . . . . . 34 11. Comparison of catch-per-unit-effort (CPUE) electrofishing per hour during spring, summer, and fall sampling periods at Lilly Park, Sunbeam, and Juniper Springs on the Yampa River, 1985 . . . . . . . . . . . . . 39 12. Comparison of catch-per-unit-effort (CPUE) electrofishing per hour between 1984 and 1985 summer samples at Lilly Park, Sunbeam, and Juniper Springs on the Yampa River . . . . . . 40 13. Comparison of catch-per-unit-effort (CPUE) electrofishing per hour between 1983, 1984, and 1985 at Lilly Park, Sunbeam, and Juniper Springs on the Yampa River . . . . . . . . . 41 e iii