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<br /> <br /> <br />1 <br />t <br />1 <br />C! <br /> <br /> <br />1 <br />t <br />t <br />r <br /> <br /> <br /> <br />1 <br /> <br />The PIT tag could overcome many of the restrictions of present fish identification <br />systems. For example, the coded-nose-wire tag has inherent shortcomings in that fish <br />must be sacrificed to obtain the tag information, and tag recovery and decoding are <br />time-consuming and expensive. The PIT tag is unique because each tag can be <br />individually coded with one of about 34 billion codes; the fish does not need to be <br />restrained or anesthetized to decode the tag; and the tag-code information can be <br />obtained electronically in vivo using a sensor placed several centimeters from the fish, <br />thus eliminating the necessity to sacrifice subject fish. Other characteristics of the PIT <br />tag are: the tag is completely passive, the tag and decoder offer no safety hazards to the <br />fish or operator, and the tagging system does not require special licenses or arduous <br />training before use. <br />The PIT tag has some drawbacks, however. The tag has to be implanted internally <br />which is a risk to the fish, requires sophisticated, expensive (reader and scanner unit is <br />presently about $1,750) equipment to detect and read, and it is not identifiable by the <br />general public. It is also costly, currently $6.00/tag. <br />OBJECTIVES <br />The objectives of this study were to: <br />1. determine the best anatomical areas and appropriate procedure in <br />which the PIT tag could be placed. <br />2. allow workers to gain expertise in implanting PIT tags. <br />3. determine tag retention. <br />4. determine the tissue response to the tag. <br />3 <br />