Standard CWT designate "batches" of specimens, (large numbers of specimens with the same code), so they are generally not used for individual identification. Anatomical location, as determined by Wand detection, can provide a limited numbers of unique codes (Tipping and Heinricher 1993 [Abstract]).
Sequential CWT are used to identify individuals or small batches. Precut sequential coded wire tags offer an inexpensive option for feasibility and small-scale studies. (see Application Note APC05 PDF 49K)
VI Alpha - The alphanumeric code of these tags provides individual identification.
VIE tags are primarily used for "batch" identification but can provide individual identifications by varying locations and colors. For example, two marks per specimen, four colors and six locations could result in 420 unique codes. (see discussion in VIE section)
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