Northwest Fisheries Science Center

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Document Type: Chapter or Section
Center: NWFSC
Document ID: 5850
Type of Book: Technical
Section or Chapter Title: PIT tag monitoring systems for hydroelectric dams and fish hatcheries
Book Title: Fish marking techniques
Author: Earl F. Prentice, Thomas A. Flagg, Clinton Scott McCutcheon
Editor: Nick C. Parker, Albert E. Giorgi, Roy C. Heidinger, Douglas B. Jester, Eric D. Prince, Gary A. Winans (Eds.)
Publication Year: 1990
Publisher: American Fisheries Society Symposium 7. Bethesda, Maryland
Pages: 323-334

Juvenile salmonids implanted with passive integrated transponder (PIT) tags can be monitored remotely as they are released from fish hatcheries or as they pass through specially designed facilities at hydroelectric dams.  We have also designed and tested a system that monitors PIT-tagged adult salmonids.  The systems record the individual PIT-tag code, time, date, and location of detection.  Interrogation systems at dams can monitor fish traveling up to 3.7 m/s and provide tag detection efficiency above 95% and reading accuracy (correct code identification) above 99.0%.  The information collected at each dam is automatically transferred to a central data base for storage and processing.  The system used to monitor hatchery releases can process over 20,000 fish/h (at a ratio of 1:4 tagged to untagged) with a 93%, or higher, PIT-tag detection efficiency and a reading accuracy above 99.0%.

Notes: AFS Symposium 7, Fish-Marking Techniques, is out of print.