472 



MECHANICAL AND ACOUSTICAL SENSES 



N. 



— ^fc * 



Figure 25 Radio receiving system for the transmitters shown in Figures 23 and 24. 

 Top right: Reception from an elevated site on Santa Catalina Island. Left: Reception 

 from small boat at sea, using elevated, hand-held antenna. System shown is the AVM 

 model LA-12 receiver with the small yagi directional antenna. Initial tests with the 

 prototype shark transmitter indicated ranges of 24-40 km from the elevated island 

 site (70 m above sea level). 



A discussion of some of the applications of telemetry in studies of free- 

 ranging sharks follows. Much of the kinds of data thus obtained would be 

 difficult or impossible to obtain by other methods. 



