Marine Research: The Shark Caller

MARINE RESEARCH

In a small control room on the Bahamian island of North Bimini, Marine Biologist Arthur Myrberg pushed a button, then stared intently at a television monitor. Within half a minute, the TV screen came alive with thrashing sharks, groupers, snappers and other large inhabitants of the deep. Myrberg's surprising underwater show had once again started on cue—as it does whenever he signals his aquatic actors.

By pressing the button, the University of Miami scientist had set off a low-frequency sound projector submerged in 60 ft. of water on the ocean floor. To any carnivorous fish within earshot, the signals...

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