Clean fish (retain bones for stock). Season fillets with salt, pepper, paprika and parsley. Roll from head down. Place in shallow baking dish.
Place bones with bay leaves, allspice, thin slices lemon, and a little salt and pepper in enouigh water to cover. Boil 15 minutes. Strain over fish and boil 10 to 15 minutes, or until cooked through; or sprinkle top with crumbs and bake fish 12-15 minutes or more in moderate oven (350°F). Serve hot.