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You are correct, Florida has not closed areas and diving has not been limited. However, there is considerable ongoing activity aimed at understanding SCTLD and finding effective treatment/prevention.
I am also concerned that Cozumel's actions may not be effective, though, this might provide an opportunity to systematically investigate the many variables that are contributing to the stress on their reefs. This information might lead to further, evidence based, interventions. It may also allow Cozumel to make a valuable contribution to the diagnosis and treatment of SCTLD, under the controlled environment of the closed area. We can only hope.
That's one of the silliest things I've read on this site and a simple google search on the matter is all it takes to see just how ridiculous it is.While talking to some locals recently (May, June) about the Sargassum they said that someone on the island built a boat dock using materials from a dismantled boat dock on the mainland and they believe that it contaminated the water on the island. Their words, not mine. I would put the incident in the category of "common knowledge."
I am staying at the Iberostar at the end of November and diving with Dive With Martin. They have communicated this and said they will be still picking up at the dock there to dive the open sites , so , not SOL but not great to eliminate so many sites at once. As most have said, nobody believes this will change anything and the bacterial spread is a result of cruise ship activity and resorts not properly managing their waste. Why someone decides to punish the divers is beyond me !!! Divers are essential to maintaining reefs everywhere ( eyes and ears witnessing reef damage and spreading the word) and not the ones wearing sunscreen .... that’s the role of all the snorkel tours in the area !!