Tiger sharks and the occasional great white and whale shark can be seen farther out to sea.
BBC: Protecting sharks off Florida��s eastern coast
Scientists in Hawaii (USA) discovered that, in the absence of patrolling tiger sharks, turtles overgrazed seagrasses until these were destroyed.
UNESCO: Open Access to Scientific Information
Earlier research in Hawaii had shown tiger sharks swimming across deep channels and finding shallow banks rich in food 50km away.
BBC: Sharks navigate using 'mental maps'
US-based scientists analysed data from tiger sharks tagged with acoustic transmitters, and found that they took directed paths from place to place.
This means he can now tell legally caught Brazilian sand tiger sharks from those protected in American waters, and can catch fibbing fishermen.
ECONOMIST: DNA tracking
"Our research shows that, at times, tiger sharks and thresher sharks don't swim randomly but swim to specific locations, " said research leader Yannis Papastamatiou from the Florida Museum of Natural History in Gainesville.
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