In a small bowl , mix together paprika, cayenne pepper, white pepper, black pepper, salt, onion powder, garlicpowder, thyme, and oregano. Heat a large cast iron skillet over high heat for 10 minutes, or until extremely hot. Dip fish into melted butter, and sprinkle each fillet generously with the seasoning mixture. Place the fish fillets in the hot skillet. Pour 1 tablespoon of butter over each fillet.