||Automatic Fish Tracking System for the U.S. E.P.A.'s (Environmental Protection Agency's) Monticello Ecological Research Station.
Zinnel, K. C. ;
Ross, M. J. ;
Kuechle, V. B. ;
||Minnesota Univ., Minneapolis. Dept. of Ecology and Behavioral Biology.;Environmental Research Lab.-Duluth, MN.
Underwater tracking ;
Animal behavior ;
Radio transmitters ;
Radio antennas ;
Performance evaluation ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
An automatic tracking system controlled by an RCA 1802 microprocessor was developed to locate fish in a 400 m outdoor experimental stream channel at the U.S. EPA Monticello Ecological Research Station. The monitoring network consisted of 12 horizontally polarized antennas spaced at 30 m intervals. The antennas were sequentially switched into a receiver and the signal strength at each antenna was measured. The microprocessor controlled all timing, switching and measurement functions. Each fish tracked by the system was tagged with an implanted radio transmitter which had a unique frequency in the 53 MHz band. Selecting a particular fish for tracking was equivalent to requesting a particular frequency entered into the memory of the receiver. The microprocessor determined which antenna had the maximum signal level and printed this information along with fish number and time of day.