Sailor's Ketch perhaps?

Really, fresh fish in the tropics may not really be such a great buy over flash frozen product, and that flash-freeze is what I believe Sailor's Ketch does ( or did), and there were often fisher-folk there who would sell from the boat/dock if you wanted it.

Bobby's, Riteway and Bucks Market will all have frozen fish. On a sailboat, unless you have very high end refrigeration, buying frozen gives you at least 1 extra day of holding capacity before you MUST cook that fish. Mahi-Mahi is something I would eagerly buy fresh, keep on actual ice and cook same day, regardless of whatever else I had planned.

Even in Maine, when I shop for fish, I am always aware that a lot of market seafood is FAS ( Frozen at Sea). FAS haddock, salmon, tuna, swordfish or cod is all fine in my opinion, but I'm not ever going to pay money for Previously Frozen scallops, or Maine lobster parts.

It would be a Feb 31 to find fresh Mahi in any market in Maine.