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LIST OF FIGURES (continued) 6 Survival of age-O Colorado pikeminnow in backwaters with different average depths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7. Geometric mean CPUEs for age-O Colorado pikeminnow and four sympatric non- native fish species (red shiner, sand shiner, fathead minnow, channel catfish) captured in primary backwaters of the Green River, Reach 3, 1987-96. Note X axis changes between some graphs .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 ACKNOWLEDGMENTS This study was funded by the Recovery Implementation Program for Endangered Fish Species in the Upper Colorado River Basin. The Recovery Program is a joint effort of the U.S. Fish and Wildlife Service; U.S. Bureau of Reclamation; Western Area Power Administration; the states of Colorado, Utah, and Wyoming; Upper Basin water users; environmental organizations; and the Colorado River Energy Distributors Association. This study was a cooperative effort between BIOIWEST, Inc.; Utah Division of Wildlife Resources (UDWR); and the Bureau of Reclamation. We thank the many individuals that helped with collaboration, logistical support, and field assistance, including Larry Crist, Quentin Bradwisch~ Erica Prats, and Yvette Converse. Special thanks to Dennis Huffman and Steve Petersburg of the National Park Service, Dinosaur National Monument, for providing field facilities and granting scientific collecting and boating permits, and Steve Brock and Dan Schaad of the Ouray National Wildlife Refuge for their assistance and granting access to roads and boat launch sites on the refuge. We also thank Chuck McAda, Frank Pfeifer, Tim Modde, and Bruce Haines of the U.S. Fish and Wildlife Service for logistical assistance and assistance in providing complete data sets. We acknowledge Kevin Bestgen and John Hayse for their insightful reviews of this manuscript. 111