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Visible Implant Alpha Tags (VI Alpha) x 100 u.


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The VI Alpha Tags are a small, fluorescent tags with an alphanumeric code designed to identify individual animals. VI Alpha Tags are implanted internally but remain externally visible for easy recovery. The new VI Alpha Tags were introduced in 2010.

VI Alpha Tags are now available in two sizes: standard (1.2 mm x 2.7 mm), shown in yellow, and large (2 mm x 5 mm), shown in orange. The larger tags are easier to read than the standard tags, and are suitable for larger animals.

Large tags have black lettering on a fluorescent orange background, while standard tags are available with black lettering on a fluorescent orange, red, yellow or green background. Each color has 2,500 different codes.

Tag readability and detection can be enhanced by fluorescing the tags with the VI Light.

VI Alpha Tags are easy to load. Slide the tag into the needle, and snap it off.

Each 100 tags ordered must be the same color, and will have consecutive coding.

  • - Easy to load and inject
    - Stable for long-term storage
    - Backed by NMT one year guarantee and expert customer service (only in United States).
  • VI Alpha Starter Kit
    - Tags (100)
    - VI Alpha Injector (1)
    - Flashlight VI Light by NMT (1)
    - Replacement Needle and Shim (1)
  • - VI Alpha Injector
  • - Flashlight VI Light by NMT
  • VI Alpha Tags are easiest to read when they are placed under clear or translucent tissue. In some cases, the tags can be placed under pigmented tissue where they are not visible in ambient light, but can be seen when they are fluoresced with the VI Light. This tends to be more effective if the tissue is evenly pigmented rather than mottled.

    Many fish have transparent tissue (adipose eyelids, fin membranes, clear boney tissue, etc.), but tag retention varies by body location and species. For example, the adipose eyelids of salmonids have generally proven to be suitable for VI Alpha tags, but implants into similar tissue in mullet (Mugulidae) have been rapidly shed. Buckmeier and Irwin (2000) found that 100% of VI Alpha Tags implanted in the dorsal fin of channel catfish Ictalurus punctatus were shed. However, researchers with the Iowa Department of Natural Resources developed a successful method of implanting VI Alpha tags into the tongue of flathead catfish (Pylodictis olivaris). The size of the tagged animal is also important. Shedding rates from adipose eyelids of salmonids less than 150 mm total length can be excessive while retention in larger fish often exceeds 90%. More on Adipose Eyelid Tissue here.

    VI Alpha and VI Elastomer Tags are widely used for individual identification of amphibians as an alternative to toe clipping. Tag retention tends to be nearly 100%, although the visibility of the tags varies based on the pigmentation of the overlying skin.

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