Combine the seasoning mix ingredients in a small bowl. Season each side of each fillet evenly with 1/2 teaspoon of the seasoning mix. Place the vegetable oil in a 12-inch nonstick skillet over high heat just until the oil just begins to smoke, about 3 to 4 minutes. Place the fillets in the pan, drizzle with butter, and cook, turning once, until they are just cooked through, about 2 to 3 minutes per side. The fillets are done when they flake easily.
Recipe courtesy of Paul Prudhomme, author, "Louisiana Tastes"