They're back. “Black tips,” “spinners” and “reef sharks” are making their presence felt off the coast of Palm Beach County in what has become an annual migration.

“Yeh for sure it’s always scary,” says one beachgoer.

Beachgoers and lifeguards on Riviera Beach have seen the feeding and mating frenzy first hand.

Warnings have been posted to keep swimmers out of the water.

“For the past few month's we've had alot of activity, we've had anywhere from 10 a day to over 100 a day,” says Captain William Crooks.