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ACKNOWLEDGEMENTS We would like to thank the Recovery Implementation Program for Endangered Fish Species in the Upper Colorado River Basin for providing funds to conduct this tagging and marking evaluation. We wish to express our gratitude to the many U. S. Fish and Wildlife Service personnel who helped with various aspects of this study. J. Holt Williamson, Buddy Jensen, Frank Pfeifer, and Lynn Kaeding were involved in formulating the study design at Dexter National Fish Hatchery and Technology Center, and provided overall administrative support. Frank and Buddy were also actively involved with tagging, marking, and monitoring of experimental fish at Dexter. Sharon Coats was invaluable for managing data. She recorded data during tagging and marking and follow-up monitoring of experimental fish, in addition to key punching data and unfailingly performing preliminary computer data analysis. Charles McAda assisted with data analysis and with electronic downloading of PIT tag codes. Troy Winham, Phillipe Sosa, and Joe Owens at Dexter National Fish Hatchery and Technology Center assisted with daily feeding of fish in the ponds and raceways in addition to removing experimental fish from ponds and raceways for monitoring. Don Hales photographed tagging and marking operations. Neal Ward, Sandra Waide, Larry Marchant, Jim Rockowski, Durand Dickman, Dick Bailey, Gerald Pearson, and other staff at Hotchkiss National Fish Hatchery gave generously of their time, provided space and equipment, and were responsible for disease prophylaxis, maintenance, and cleaning of tanks, and daily feeding of the juvenile Colorado squawfish held there. Harold Tyus provided direction into the study design of razorback sucker PIT tagged at the Ouray Endangered Fish Hatchery. Mel Hughes and Tom Hatch assisted PIT tagging juvenile razorback sucker at the Ouray facility; Tom, Mel, and Steve Severson were responsible for the daily care, feeding, and maintenance of fish at the Ouray facility. Anita Martinez, Mike Cunningham, Dale Ryden, Tom Drombroski, Doy Garner, and John Andersen assisted with data collection. Peter Bergman and Frank Haw of Northwest Marine Technology, Inc. offered technical assistance and advice for use of the visible implant tag. They examined frozen hatchery-reared endangered fish and from these specimens identified preliminary target sites for implanting visible implant tags. They also furnished visible implant tags, injectors, and other related tagging materials for the study at Dexter. Lee Blankenship of the Washington Department of Fisheries demonstrated the use and participated in implanting the visible implant tag in experimental fish at Dexter National Fish Hatchery and Technology Center. David Propst, Tom Chart, Richard Valdez, Tom Nesler, Tim Modde, Holt Williamson, Lucy Jordan, and Frank Pfeifer provided useful comments on an earlier draft of this report. Support and assistance from others not mentioned is no less appreciated. viii