In the Caribbean you may at times find a small owner operated place serving some local fish when they can get it. With limited refrigeration on the fishing boats and the short shelf life or fish. "Fresh" is in the eye of the beholder or marketeer. Most of what you will find is frozen and portion controlled from some faraway factory of factory ship. The Caribbean lacks the estuaries that enable the food chains needed for robust fisheries. If fresh fish is your passion you may find better luck closer to New Orleans, Maine at times, and even New York City. In the Caribbean the pork and chicken are the better fares. Yes, you can always luck out and find yourself in the right place at the right time. If there were bountiful fresh fish for human consumption anywhere near St. Martin you would see a big fleet of commercial fishing vessels in the harbors and waters to capitalize on the fishery.