In 2006 there was a fatal attack supposedly by a bull shark in Boca Ciega bay (near St. Petersburg). Around Sunset a man went for a swim off his dock and was attacked. It was speculated that he may have been in a school of baitfish when the attack occurred.
It seems that most attacks occur at dusk or dawn in low light conditions. However, I was bitten by a black tip around mid afternoon (very minor bite) while wade fishing in knee deep water. I felt something tugging on my knee. I looked down at my knee and had a bite that was about 2 inches long, barely breaking the skin but drew blood. I looked around and there was a 3' blacktop circling me. To make a long story short, after three days of pain and agony, the shark died