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I have been diving Cozumel at least once a year since 1991, usually in May. Some trips I see clouds of these things and some none at all. i haven't noticed a trend up or down in their numbers over the years; sometimes they are there and sometimes they are not.Just curious if anyone has seen these this year. Years past there were clouds of these on the surface but so far I have yet to see one this year. Global warming changes?