I got a chance to fish with Capt. Alex and friend "Redfish Chuck" Levi while in northern Florida this past December. One of the issues we encountered was dirty water and poor water visibility. We really needed to head downriver to find some clean water. Both Chuck and Alex told me about the cleanliness of the river, of the problems with the dying manatee grass and lack of submerged aquatic vegetation, and how it was affecting the fishery. It was apparent then, and has gotten progressively worse.
Read on for some more info - http://www.orlandosentinel.com/news/environment/os-florida-water-catastrophe-statewide-20160304-story.html