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The sting of the lionfish is something you will not want to experience.
If it ever happens to you, use warm water from the engines of the boat. I know because I'm telling you

Oh yes, never touch a lionfish... I made a night dive too in the maldives and there were many lionfishes. Especially in the night they are hunting and you have to take care of them very much, especially if you are diving with a short suit, like me in this night dive. :)

I chase them and I eat them. They are very good in steak