You can see where this one has been hit or scraped on the head from I assume a boat that hit it
This picture shows its tail that has been sliced off presumably from a speeding boat. During the winter each year there are "Manatee areas" that are protected that are essentially a no wake area for boats. Hopefully, that will prevent things like this tail slice from happening.
After spending the afternoon in the harbor the Manatee left and hasn't been back. Hard to figure where it would go although the waters around here are nice and warm which it probably likes.