CITRUS-BAKED FISH

1 orange, unpeeled, cut into very thin slices
1 lemon, unpeeled, cut into very thin slices
1 lime, unpeeled, cut into very thin slices
1 large onion, peeled and cut into very thin slices
1 tsp. salt
2  3 tsp. Old Bay seasoning
1 whole fish, gutted (head can be on or off as you prefer), about 5 lbs.
3 Tbs. butter or margarine

Mix together fruits, onions, Old Bay and salt. Place fish on a rack in a baking dish and put 2/3 of the citrus mixture in the center cavity and 1/3 on top. Dot with butter. Bake at 350 degrees until fish is done. Discard stuffing before serving.