Rinse fish thoroughly in cold water; pat dry. Sprinkle fish with salt and pepper. Combine butter and lemon juice. Dip fish in butter mixture; roll in crushed crackers.
Place fish on an aluminum foil-lined shallow baking pan. Bake, uncovered, at 400° for 20 minutes or until fish flakes easily when tested with a fork. (Tails of fish may be covered with aluminum foil to avoid overbrowning.)
Transfer fish to a serving platter. Garnish with parsley, if desired. Serve immediately.