Thanks for posting the maps; interesting to see what is going on in the area.
I agree, cannot blame it all on any one cause. There obviously are a lot of sources of nutrients and waste flowing into Lake Okeechobee and other waterways.
Stayed in the Stuart area, Hutchinson Island, back in July. The beach was beautiful, and we had the Indian River on the other side. Locals warned us not to eat any of the fish from the river AND the ocean, because of the algae and health risks. Was hard saying goodbye to redfish. Were also told not to get into the river, thankfully the kids haven't got sick as we found them jumping off the dock. In some areas, just being outside is making people ill. Sad situation. Needs to be figured out and remedied.
I've never heard of fertilization restrictions down this way, but going to check now.