Fishes have neither organs of hearing, nor yet the exterior orifice. And yet, it is quite certain that they do hear; for it is a well-known fact, that in some fish-ponds they are in the habit of being assembled to be fed by the clapping of the hands. In the fish-ponds, too, that belong to the Emperor, the fish are in the habit of coming, each kind as it bears its name.[1] So too, it is said, the mullet, the wolf-fish, the salpa, and the chromis, have a very exquisite sense of hearing, and that it is for this reason that they frequent shallow water.