Place fish in a 11x7x2-inch baking dish coated with nonstick cooking spray. Sprinkle with parsley and pepper. In a skillet, saute onion and garlic and butter until tender. Sprinkle over fish. Combine juices and orange peel. Drizzle over fish. Bake uncovered at 375 degrees for 20 to 25 minutes. Makes 4 servings.