This is one of the most extensive seafood markets that I would've never expected to find in the heart of a city.
The selection here is excellent. You walk in, and there are rows of fish on ice, live crabs, crawfish, and lobsters. Pick out what you want, take it to the counter, so they'll clean it for you, and wait for your number to be called. It's as simple as that and quicker than you would imagine.
I'd definitely go here again. Etiquette tip: do not play with the fish and make them talk to people. It kind of freaks out some of the Asians that are there shopping, but if that's your thing, it's up to you.