Common carp tissue reactions to surgically implanted radio tags with external antennas

Examination of common carp Cyprinus carpio, carrying implanted telemetry transmitters, showed that wound healing was incomplete after 4 months and completed after 1 year. Granulation tissue, which encapsulated the transmitter, adhered to the intestine and liver. The liver was infiltrated by the granulation tissue after 1 year. Epidermal tissue grew down the channel for the antenna, establishing a potential pathway for pathogens. No signs of infections, however, were found.