PALM BEACH, FLORIDA — Around 10,000 to 20,000 sharks are currently living in Florida's coastal waters, researchers have said.

Perhaps more frighteningly for beachgoers, that number only represents those visible and close to the shore. According to Stephen Kajiura, a biological sciences professor at Florida Atlantic University, there may be more of these 18kg predators overall.

According to Discovery's LiveScience website, these blacktip sharks usually spend the summer near Georgia and the Carolinas and then head south for warmer waters come winter.

"You can literally sit on the beach and you can watch the blacktips jumping and spinning and splashing back into the water," Kajiura told LiveScience. "They're not out to get you, you're not part of their diet, so you may as well go to the beach and enjoy the phenomenon."

Between 1670 and 2000 there were only 48 reported human fatalities from 705 shark on human attacks in the U.S., according to the country's National Oceanic and Atmospheric Administration.

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