Fish for the most part breed some time or other during the three
months between the middle of March and the middle of June. Some few
breed in autumn: as, for instance, the saupe and the sargus, and
such others of this sort as breed shortly before the autumn equinox;
likewise the electric ray and the angel-fish. Other fishes breed
both in winter and in summer, as was previously observed: as, for
instance, in winter-time the basse, the grey mullet, and the belone or
pipe-fish; and in summer-time, from the middle of June to the middle
of July, the female tunny, about the time of the summer solstice;
and the tunny lays a sac-like enclosure in which are contained a
number of small eggs. The ryades or shoal-fishes breed in summer.