There are certain

fish that are nicknamed the epitragiae, or
capon-fish, and, by the way, fish of this description are found in
fresh water, as the carp and the balagrus. This sort of fish never has
either roe or milt; but they are hard and fat all over, and are
furnished with a small gut; and these fish are regarded as of
super-excellent quality.

Again, just as in testaceans and in plants there is what bears and
engenders, but not what impregnates, so is it, among fishes, with
the psetta, the erythrinus, and the channe; for these fish are in
all cases found furnished with eggs.