Hi takeshi,
In areas where they are not shot so heavily, you can get close to a grouper in the open, if you do it right. I don't know Cuban conditions, but try getting directly above the fish and going straight down. Weight yourself so you don't have to move after the first 4 or 5 meters. There is something about approaching from directly overhead that works. Anything over 7 kg or so and you will want a slip tip or other detachable head on a line gun. For free shaft, spring steel with a simple flapper barb works fine for even big fish.
Good luck, and leave the big ones alone. They are rare and much more fun to see than shoot.
Connor
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