RedactedNarrative: Vessel 1 was engaged in water tubing. Two persons, a father and daughter were on the tube. The daughter was wearing a class 2 PFD, the father was not at the time of incident. The father was not properly holding on to the handles on the tube. There came a point in time when the father fell off the tube, the daughter grabbed and held onto victim to prevent him from totally submerging. A passenger jumped from the boat into the water to retrieve the victim. Monroe County Sheriff's Marine Units were notified and responded to the location of incident. The vessel did head to South Bay Boat and Tackle where the boat was rented from, with the victim. Arrangements were made for emergency Medical Units to meet the vessel at that location.