Place walleye in a greased shallow 3 litre or 13-in. x 9-in. x 2-in. baking dish. Combine tomato sauce, parsley, Italian seasoning, basil, salt and pepper; pour over the fish. Bake, uncovered, at 180ºC or 15 minutes. Sprinkle with mozzarella cheese. Bake 5-10 minutes longer or until fish