Boat propeller strikes are the leading cause of manatee mortality and injury in Florida, causing severe wounds that require intensive rehabilitation and leave survivors with permanent scarring that serves as individual identification.
Boat strike welfare harm to manatees is severe and often fatal. Propeller lacerations that penetrate to bone cause acute pain and chronic wound complications. Manatees that survive strikes require intensive veterinary care — wound management, fluid therapy, nutritional support, and monitoring for infection and internal injuries. Rehabilitation periods of months to years demonstrate the severity of typical strike injuries. The individual identification possible through scar mapping reveals a particularly troubling pattern: individual manatees are struck multiple times across their lives, surviving each encounter more damaged than before. Speed zones are effective when enforced but boaters often violate them or fail to slow to posted speeds. The welfare solution requires both physical deterrents — manatee protection zones — and behavioral change among recreational boaters through education and enforcement.