6. Among river fish the male glanis is very careful of his young fry, but the female goes away as soon as she has deposited her ova, but the male continues to watch by the greater number of the ova, paying them no more attention than to drive away other fish, that they may not carry away the ova; he is thus employed for forty or fifty days until the young fry are so far grown that they can escape from other fish; the fishermen know when it is guarding its ova, for it drives away other fish, and as it jumps at them it makes a noise and a murmur. It remains with such affection beside its ova, that if they are deposited in deep water, and the fishermen attempt to bring them into shallow water, the fish will not forsake them; but if young it is easily taken with a hook, from its habit of seizing upon any fish that may come in its way; but if it is experienced, and has swallowed a hook before, it does not leave its ova, but with its hard teeth it will bite and destroy the hook. 7. All creatures with fins, and stationary animals, inhabit either the places in which they were born, or similar localities, for their peculiar food is found in such places. The carnivorous fish are the greatest wanderers; all are carnivorous with a few exceptions, as the cestreus, salpa, trigla, and chalcis. The mucous substance which the pholis emits forms around it, and resembles a chamber. Of the apodal testacea, the pecten is the most locomotive, for it flies by means of its own valves; the purpura and its congeners advance very slowly. 8. All the fish except the cobius leave the Pyrrhic Euripus during the winter on account of the cold, for the Euripus is colder than the sea, and return again in the spring. In the Euripus the scarus, the thrissa, all the thorny fish, the galus, acanthia, carabus, polypus, bolitæna, and some others are wanting, and of those that are produced in the Euripus, the white cobius is not an inhabitant of the sea. Those fish which have ova are in the highest season in the spring, before they produce their ova; those that are viviparous in the autumn, and besides these the cestreus, trigla, and their congeners. In the neighbourhood of Lesbos, both the marine fish and those of the Euripus produce their ova in the Euripus; they copulate in the autumn, and deposit their ova in the spring. The males and females of the selachea also mix together, in numbers, in the autumn, for the purpose of copulation; but in the spring they separate until they have produced their young; at the period of sexual intercourse, they are often taken united together.