I saw video of a shark in knee deep water off the Atlantic coast around Daytona last night on the news show I follow and there was a guy looking the other way paddling as it swam past him!! You could see its dorsal and top of the tail fin about 6 feet apart...............so big enough.I snorkelled very close to base.
There have been numerous shark attacks in the shallow waters all down the Atlantic coast mainly from juvenile fish big enough to cause cuts and lacerations, mainly on kids.
Tony.
ps. Please note .......... there are no sharks in our pool.