We met two people in the Bahamas who got it. One other person in their party came very close to dying from it, and they all get re-occurrences of it when eating random foods. From what I understand, avoid barracuda, black grouper, certain snapper and certain jacks, and large (older) predatory reef fish. We stuck to mackerel, mahi and smaller jacks and snapper (the fact that we never caught any larger fish other than mahi had no relevance
)