I letter from my Congressman, Brian Mast, led to look online regarding toxins from algae blooms. In the process I found this article from the Mote Institute of Sarasota regarding the Florida Red Tide.
mote.org
I thought it was pretty informative. This has been a topic here before. 

Florida Red Tide FAQs
How can I find out what current red tide conditions are? What is Florida red tide? What causes a Florida red tide? Has coastal (nutrient) pollution caused the Florida red tide? Can coastal nutrient pollution worsen an existing Florida red tide that has moved to shore? Do freshwater outflows...