West Indian manatees face an array of human-caused welfare threats including boat strikes, cold stress, entanglement, and habitat degradation that cause chronic injury and population-level harm to these slow-moving marine mammals.
Manatee welfare is chronically compromised by human activity across their range. Propeller injuries cause acute trauma — deep lacerations that become infected and require weeks of rehabilitation if the animal survives. Even non-fatal strikes cause pain and stress that affects feeding and movement. Chronic cold stress from loss of warm water refugia causes cold stress syndrome — a condition of progressive immune failure, pneumonia, and starvation when manatees cannot thermoregulate. Seagrass loss from nutrient pollution creates a food crisis that leaves manatees in a state of chronic malnutrition. The cumulative welfare burden on individual manatees in heavily impacted areas is severe. Speed zone enforcement, seagrass restoration, and red tide monitoring and response are the primary welfare interventions available.