<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 />
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