The incident was reported off the northwest side of Santa Rosa Island at about 3:15 p.m.
The U.S. Coast Guard says a good Samaritan notified Coast Guard watchstanders of a 37-year-old man who had been bitten by a shark on his right leg. A tourniquet was placed on the man's leg to prevent further blood loss, and he was later taken to a hospital where he was reportedly in stable condition.
Officials are unsure of what type of shark attacked the man.