I had one nibble a fin when I was drift diving on a wreck off of Palm Beach once...it was a freighter that a U-Boat nailed right on the edge of the Gulf Stream, and the current was a *****. Damned shark stayed right with me, and just kept nibbling at my fin. Worst dive ever.
Bull sharks are the nastiest, most dangerous sharks. But they still deserve the own niche in nature.
