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CWT Detectors

Due to their small size, and usual position in opaque tissue, CWT must be located and recovered using specialized magnetic detectors that come in various forms (e.g., Wand, tunnels, V-Detector). Once excised, CWT are visually decoded under magnification of about 10x. CWT are normally dissected from dead/harvested fish, but the method offers considerable opportunity to recover data from living specimens as well:

• Simply knowing a fish is tagged, as determined by the CWT detector, can provide a simple "yes or no" answer (e.g., identifying hatchery origin fish in a mixed population, etc.).
• Specific location (e.g., left cheek, right cheek, nape, origin of dorsal fin, etc.) of the implanted CWT, as determined by a Wand Detector, can provide a number - increasing with animal size - of different "codes" (Tipping and Heinricher, 1993).
• Shallow, and often visible implants of CWT, may be excised without significant damage to the animal (Oven and Blankenship 1993).

Electronic Detection Products

• V-Detector
• Handheld Wand Detector
• Quality Control Device (QCD)
• Tunnel Detectors (R-Series)

• T4 Detector

• T13 Detector

Related Product

• CWT Detection Standard

Northwest Marine Technology, Inc.                   (360) 468 - 3375

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Last edited: 04 Feb 2008