Definitions for "PIT tag"
a radio frequency microchip about the size of a grain of rice that transmits a unique ID code or number to a special detection wand
A computer chip attached to a wire antenna and encapsulated in a biologically inert glass capsule. The tag is excited when it is passed through the electromagnetic field of a detector and the information on the computer chip is transmitted to the detector. See Research: PIT-Tagging and Other Research Tools, Pacific Salmon Coordination Office for a short description and illustration.
Passive Interrogative Transponder tag; a tag that is typically inserted into the peritoneal cavity and allows identification of individual fish when they pass a detection facility.