The date on the door is the thing to know. The Mississippi Aquarium opened to the public on 29 August 2020, fifteen years to the day after Hurricane Katrina came ashore, on a beachfront that had been without a marine attraction since the storm destroyed the oceanarium that used to stand in Gulfport. The choice of date was deliberate, and on this coast it was read exactly as it was meant.
What opened is substantial: about 5.8 acres and eighty thousand square feet, twelve major exhibits, over a million gallons of fresh and salt water between them, more than two hundred species of animals and around fifty species of native plants. It cost a reported ninety-three million dollars in federal, state and local grants and private money, and it was designed by a Biloxi architecture practice with an American exhibit-design firm, which is why the three sail forms over the entrance look like a local idea rather than an imported one.
The animals people come for are the bottlenose dolphins, the African penguins, the river otters and the alligators, and the signature piece of engineering is a 360-degree acrylic tunnel that puts sharks and rays over your head as well as beside you. The collection leans deliberately towards the Gulf and the Mississippi river system rather than towards a generic global aquarium, so a good proportion of what you are looking at lives within a hundred miles of the car park.
Two practical points. It is in Gulfport, not Biloxi, about twenty minutes west along the beach road, which surprises people who booked a Biloxi hotel on the strength of it. And a large share of the site is open-air, with habitats, walkways and gardens outside under the Mississippi sun. In July that makes late afternoon considerably more pleasant than midday, and it makes a wet morning less of a guaranteed refuge than an indoor-only aquarium would be.