480 MECHANICAL AND ACOUSTICAL SENSES 



use telemetry to provide the necessary "picture" of the shark's path imme- 

 diately after reception of the low-frequency attractive sounds. In acous- 

 tically suitable home-range areas, it is planned to establish several indi- 

 viduals carrying transponder or timefix transmitters, possibly also with 

 compass sensors. The experimental low-frequency playbacks can then be 

 made on any subsequent day, whenever a telemetered shark passes by at 

 the desired distance and direction. 



ACKNOWLEDGMENTS 



The author gratefully acknowledges the assistance of the many persons who 

 participated in the shark-telemetry project at California State University, 

 Long Beach, including H. Carter and D. Ferrel (circuit design); J. McKibben, 

 G. Pittenger, G. Zimmerman, T. Sciarrotta, and E. Standora (transmitter 

 development and testing); T. Tricas, R. Johnson, D. Cooksey, R. McKenzie, 

 and D. Mosher (tracking sharks at sea); and D. Rowell (computer program- 

 ming). Sincere thanks are due D. Pincock (manuscript review), W. Koelsch 

 of Keldron, Inc. (hybrid circuit design), T. Madison and W. Bunker of 

 International Transducer Corporation (transducer calibration), and espe- 

 cially R. Cyr of Sonatech, Inc. (transponder circuitry and help with the 

 System Performance section of this paper). The author also acknowledges 

 the assistance of the Department of Biology, California State University, 

 Long Beach, and the U.S. Office of Naval Research through contract 

 N00014-75-C-0204 under project NR-1 04-062 for supporting the program 

 of shark-behavior research of which the telemetry project is a part. 



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