Northwest Fisheries Science Center

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Document Type: Chapter or Section
Center: NWFSC
Document ID: 5849
Type of Book: Technical
Section or Chapter Title: Feasibility of using implantable passive integrated transponder (PIT) tags in salmonids
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
Volume: 7
Pages: 317-322

The technical and biological feasibility of using passive integrated transponder (PIT) tags for tagging salmonids has been evaluated by the U.S. National Marine Fisheries Service.  Each tag is 12.0 mm long by 2.1 mm in diameter and is coded with one of 34 × 109 codes.  When energized at 400 kHz, the tag transmits a return signal at 40 to 50 kHz.  The tag can be detected in situ at a distance up to 18 cm, which eliminates the need to anesthetize, handle, or restrain fish during data gathering.  The tag's longevity is estimated at 10 or more years.  The body cavity of juvenile and adult salmonids was found to be an acceptable site for implantation.  The PIT tag did not adversely affect growth or survival in laboratory and field tests.  Swim-chamber tests showed no significant effect of the tag on respiratory rate, tail-beat frequency, stamina, or survival of juvenile salmonids.  Tag retention within the body cavity was nearly 100% for salmonids ranging in size from 50 to 800 mm, fork length.  Previously PIT-tagged salmon that were hand-stripped of sperm and eggs showed high tag retention and no adverse effects of the tag.

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