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Agree; no stonefish in the Caribbean.Scorpionfish. Not only does it 'look like one' (a loaded phrase, since there are many species), but I don't think there are any species of stonefish in the Caribbean, and you said this was in Cozumel.
From what I've read of the horrendous pain of stonefish stings, I'm glad they aren't in the Caribbean.
I saw this dude in St Lucia. Locals called it stonefish…