§2.93.1οἱ δὲ ἰχθύες οἱ ἀγελαῖοι ἐν μὲν τοῖσι ποταμοῖσι οὐ μάλα γίνονται, τρεφόμενοι δὲ ἐν τῇσι λίμνῃσι τοιάδε ποιεῦσι.
The shoaling fish are not produced much in the rivers, but being reared in the lakes, they act as follows.
ἐπεάν σφεας ἐσίῃ οἶστρος κυΐσκεσθαι, ἀγεληδὸν ἐκπλέουσι ἐς θάλασσαν· ἡγέονται δὲ οἱ ἔρσενες ἀπορραίνοντες τοῦ θοροῦ, αἳ δὲ ἑπόμεναι ἀνακάπτουσι καὶ ἐξ αὐτοῦ κυΐσκονται.
When the desire to conceive seizes them, they swim out in shoals toward the sea; the males lead the way, sprinkling their milt, while the females, following behind, gulp it down and are conceived from it.
§2.93.2ἐπεὰν δὲ πλήρεες γένωνται ἐν τῇ θαλάσσῃ, ἀναπλώουσι ὀπίσω ἐς ἤθεα τὰ ἑωυτῶν ἕκαστοι, ἡγέονται μέντοι γε οὐκέτι οἱ αὐτοί, ἀλλὰ τῶν θηλέων γίνεται ἡ ἡγεμονία· ἡγεύμεναι δὲ ἀγεληδὸν ποιεῦσι οἷόν περ ἐποίευν οἱ ἔρσενες· τῶν γὰρ ᾠῶν ἀπορραίνουσι κατʼ ὀλίγους τῶν κέγχρων, οἱ δὲ ἔρσενες καταπίνουσι ἑπόμενοι.
When they have become full in the sea, they swim back up to their own respective haunts; however, the leaders are no longer the same, but the leadership falls to the females; leading the shoal, they do just what the males did; for they sprinkle their eggs, a few grains at a time, and the males, following behind, swallow them down.
εἰσὶ δὲ οἱ κέγχροι οὗτοι ἰχθύες.
These grains are indeed fish.
§2.93.3ἐκ δὲ τῶν περιγινομένων καὶ μὴ καταπινομένων κέγχρων οἱ τρεφόμενοι ἰχθύες γίνονται.
From the grains that survive and are not swallowed, the fish that are reared are produced.
οἵ δʼ ἂν αὐτῶν ἁλῶσι ἐκπλώοντες ἐς θάλασσαν, φαίνονται τετριμμένοι τὰ ἐπʼ ἀριστερὰ τῶν κεφαλέων, οἳ δʼ ἂν ὀπίσω ἀναπλώοντες, τὰ ἐπὶ δεξιὰ τετρίφαται.
Those of them that are caught swimming out to the sea appear to have the left side of their heads rubbed, while those that are caught swimming back up have the right side rubbed.
§2.93.4πάσχουσι δὲ ταῦτα διὰ τόδε· ἐχόμενοι τῆς γῆς ἐπʼ ἀριστερὰ καταπλώουσι ἐς θάλασσαν, καὶ ἀναπλώοντες ὀπίσω τῆς αὐτῆς ἀντέχονται, ἐγχριμπτόμενοι καὶ ψαύοντες ὡς μάλιστα, ἵνα δὴ μὴ ἁμάρτοιεν τῆς ὁδοῦ διὰ τὸν ῥόον.
They suffer this for the following reason: they swim down to the sea keeping the land close on their left, and when they swim back up, they hold to the same side of the land, rubbing against it and touching it as much as possible, so that they may not lose their way because of the current.
§2.93.5ἐπεὰν δὲ πληθύνεσθαι ἄρχηται ὁ Νεῖλος, τά τε κοῖλα τῆς γῆς καὶ τὰ τέλματα τὰ παρὰ τὸν ποταμὸν πρῶτα ἄρχεται πίμπλασθαι διηθέοντος τοῦ ὕδατος ἐκ τοῦ ποταμοῦ· καὶ αὐτίκα τε πλέα γίνεται ταῦτα καὶ παραχρῆμα ἰχθύων σμικρῶν πίμπλαται πάντα.
When the Nile begins to rise, the hollow places of the land and the marshes near the river first begin to fill as the water filters through from the river; and as soon as these are full, they are immediately filled everywhere with small fish.
§2.93.6κόθεν δὲ οἰκὸς αὐτοὺς γίνεσθαι, ἐγώ μοι δοκέω κατανοέειν τοῦτο· τοῦ προτέρου ἔτεος ἐπεὰν ἀπολίπῃ ὁ Νεῖλος, οἱ ἰχθύες ἐντεκόντες ᾠὰ ἐς τὴν ἰλὺν ἅμα τῷ ἐσχάτῳ ὕδατι ἀπαλλάσσονται· ἐπεὰν δὲ περιελθόντος τοῦ χρόνου πάλιν ἐπέλθῃ τὸ ὕδωρ, ἐκ τῶν ᾠῶν τούτων παραυτίκα γίνονται οἱ ἰχθύες οὗτοι.
Whence it is likely that these are produced, I think I understand this: in the preceding year, when the Nile recedes, the fish, having laid eggs in the mud, depart together with the last of the water; and when, as the season comes round, the water comes back again, from these eggs these fish are immediately produced.