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List of Figures (continued) Figure Page 14 Length frequency distributions of channel catfish in the Yampa River by river reach and year. (TL=total length) . . .. ............... 30 15 Flow regime at two gage stations on the Colorado River, Colorado from March - September, 1989-1990. (5-day means) . . . . . . . . . . . . . . . 32 16 Length frequency distributions of channel catfish in the Colorado River, 1989-1990. (TL=total length) ...... . . . .. ............... 33 17 Length-weight relationships for channel catfish in the Yampa and Colorado rivers. (TL=total length) . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 18 Temperature regime at two gage stations on Colorado River, Colorado, March - September 1989-1990. (5-day means, daily maximum) . . . . . . . . . . . . . . 37 19 Percent occurrence (incidence of ingestion) of food items eaten by northern pike and channel catfish in the Yampa River, Colorado. ............. 39 20 Composition and length frequency distribution of fish prey eaten by northern pike in the Yampa River, Colorado. . . . . . . . . .. ............. 40 21 Regression of northern pike length versus fish prey length. (TL=total length) . . . . . . . . . . . . . 4l 22 Length frequency distribution of fish species captured in association with northern pike in select habitats in the Yampa River, Colorado. ............. 43 23 Percent occurrence (incidence of ingestion) of food items eaten by largemouth bass and green sunfish in the Colorado River, Colorado. . . . . . . . . . . . . . 44 24 Percent occurrence (incidence of ingestion) of food items eaten by channel catfish and black bullhead in the Colorado River, Colorado. ............ 45 25 Length frequency distribution of select gamefish species in association with Colorado squawfish in select habitats in the Colorado River, Colorado. (TL=total length) . . . . . . . . . . . . . . . . . . . . . . . . . 46 vii