Take a small bowl, add buttermilk, salt, pepper and water to it. Mix well, so all ingredients are blended. Take a flat pan to make fillets. On the bottom layer of the pan, layer the fish, and then turn to coat both sides. Put it aside to let it marinate.

Take out a plastic bag of volume 2 gallons, and then add in cornmeal, all-purpose flour, and seafood seasoning. Now, mix them well. Add fish to the prepared mixture. You should add a few fillets at a time. Now, gently coat the fish from all sides while tumbling.

Take a deep fryer and heat oil to 185 degrees Celcius.

Deep fry the coated fillets until they turn brown. It will take 3 minutes in total. Don't add too many fillets in a single go; to allow proper browning, add some of them. On frying, the fish will turn crispy and moist from the inside. Inside, it will appear flakier. Drain out the fish from oil on paper towels.