More on the Sargassum issue! Colleagues in Antigua are saying that 2018 is already, without a doubt, the worst Sargassum year to date. Check out this image that shows how it affects coastal waters when it collects in high densities.
For more on the issue, check out this youtube video highlighting research out of IRD, Aix-Marseille University, the University of the West Indies, and the University of Western Brittany.