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<br />PERFORMANCE OF PIT TAG INTERROGATION SYSTEMS <br /> <br />415 <br /> <br />problems), excessive heat shutting down transceivers, <br />theft, wildlife chewing into cables, floating logs <br />dislodging antennas, and moving substrate damaging <br />cables and antennas. In addition, the probability of a <br />tagged fish's blocking the reading of other fish passing <br />by or through the system is reduced when multiple <br />small antennas are used. The use of smaller antennas <br />can reduce the problems associated with attaching them <br />to an uneven stream bottom. Combinations of these <br />kinds of problems have convinced us that there is a <br />high potential for mishaps when attempting to keep <br />these systems operating for extended periods of time, <br />and that measures for redundancy are warranted based <br />on the value of the data. <br /> <br />Acknowledgments . <br /> <br />Development, installation, and maintenance of the <br />interrogation systems relied on several National <br />Oceanic and Atmospheric Administration personnel, <br />including Sandra Downing, Bruce Jonasson, Ed <br />Nunnallee (retired), and the National Marine Fisheries <br />Service Pasco Field Station shop crew, especially Jim <br />Simonson and William Wassard. The PIT-tagging field <br />work and day-to-day maintenance of the detector <br />system was conducted by U.S. Geology Survey <br />(USGS) personnel, including Brian Fisher, Wes <br />Tibbits, Ben Lenz, Brady Allen, Jodi Charrier, Gene <br />Hoilman, Carrie Munz, Sarah Rose, Chris Schaeffer, <br />and Joel Quenette. We thank Russell Perry of the <br />USGS for helping us develop the estimates of variance <br />for detection efficiency. The two interrogator sites were <br />located on private land, and we much appreciate the <br />access granted by landowners Steve Stampfli. Terry <br />Tietjen, and Vic Stokes. We also thank Pacific States <br />Marine Fisheries Commission's field crew, including <br />Allen Brower, Darren Chase, Scott Livingston, and <br />Don Warf, as well as the PTAGIS database crew <br />including Dave Marvin, Carter Stein, and John Tenney. <br />Dan Rawding of Washington Department of Fish and <br />Wildlife and Eric Janney of USGS provided helpful <br />reviews of an earlier version of the manuscript. <br />William Connor of U.S. Pish and Wildlife Service <br />and two anonymous reviewers provided valuable <br />comments and suggestions. TIle Rattlesnake Creek <br />work was supported from a larger effort funded by <br />Bonneville Power Administration, and the Beaver <br />Creek work was supported from a larger effort funded <br />by the U.S. Bureau of Reclamation. Any use of trade <br />names is for descriptive purposes only and does not <br />imply endorsement of the U.S. government. <br /> <br />References <br /> <br />Achord. S., G. M. Matthews, O. W. 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