XXIII.13 On seaports
In seaports, where men expose themselves to a thousand dangers and go to die or live in remote climes, there are fewer men than women, yet we see more children there than elsewhere : this is owing to the ease of subsistence. It could even be that the oily parts of fish are better at supplying the material that goes into generation. That would be one of the causes for the infinite population there is in Japan  and in China,  where they live almost exclusively on fish.  If so, certain monastic rules which require living on fish would be contrary to the spirit of even the legislator.