The Histories · 2.93

Fish which swim in shoals are not much produced in the rivers, but are bred in the lakes, and they do as follows:—When there comes upon them the desire to breed, they swim out in shoals towards the sea; and the males lead the way shedding forth their milt as they go, while the females, coming after and swallowing it up, from it become impregnated: and when they have become full of young in the sea they swim up back again, each shoal to its own haunts. The same however no longer lead the way as before, but the lead comes now to the females, and they leading the way in shoals do just as the males did, that is to say they shed forth their eggs by a few grains at a time, and the males coming after swallow them up. Now these grains are fish, and from the grains which survive and are not swallowed, the fish grow which afterwards are bred up. Now those of the fish which are caught as they swim…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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