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LIST OF FIGURES 1. Map of the Colorado river study area ................................... 3 2. Annual population estimates of Colorado pikeminnow ( > 250 mm long) for the lower reach (model M) and upper reach (model K) ................. 17 3. Numbers of adults (> 500 mm TL) in relation to the total sampled population (? 250 mm TL) in the upper reach, lower reach and the whole river ................................................. 18 4. Catch rates (fish/net) of Colorado pikeminnow in backwaters of the upper reach, lower reach, and the whole river ............................ 20 5. ISW catch rates (fish/hr of electrofishing) of Colorado pikeminnow along shorelines in sub-reaches of the upper and lower reaches ............... 22 6. Annual mean catch rates (fish/net) of eight large-bodied fish species in backwaters of the upper reach ..................................... 24 7. Annual catch rates (fish/net) of three sympatric large-bodied native fish species in backwaters of the upper study reach ........................... 25 8. Annual catch rates (fish/net) of four sympatric large-bodied non-native fish species in backwaters of the upper study reach ........................ 26 9. Growth curve of Colorado pikeminnow calculated from revised annual growth increments ................................................ 33 10. Length-frequency histogram of male and female Colorado pikeminnow captured river-wide in 1999 and 2000 ................................. 35 11. Growth curves of male and female Colorado pikeminnow calculated from gender-specific annual growth increments .......................... 38 12. Mean relative condition of Colorado pikeminnow by length-class, study reach, and study period ........................................ 39 13. Annual mean relative body condition of Colorado pikeminnow 500-599 mm long in the upper and lower reaches ................................... 40 IV