Plutarch Quaestiones Convivales 8.8.4

[4] To this Nestor subjoining said: But, sir, of my citizens, as of the Megarians in the proverb, you make no account; although you have often heard me say that our priests of Neptune (whom we call Hieromnemons) never eat fish. For Neptune himself is called the Generator. And the race of Hellen sacrificed to Neptune as the first father, imagining, as likewise the Syrians did, that man rose from a liquid substance. And therefore they worship a fish as of the same production and breeding with themselves, in this matter being more happy in their philosophy than Anaximander; for he says that fish and men were not produced in the same substances, but that men were first produced in fishes, and, when they were grown up and able to help themselves, were thrown out, and so lived upon the land. Therefore, as the fire devours its parents, that is, the matter out of which it was first kindled, so Anaximander, asserting that fish were our common parents, condemneth our feeding on them.