All kinds of fish grow2338 with remarkable rapidity, and more especially those in the Euxine; the reason2339 of which is the vast number of rivers which discharge their fresh water into it. One fish, the growth of which is quite perceptible, day by day, is known as the amia.2340 This fish, and the pelamides, together with the tunnies,2341 enter the Euxine in shoals, for the purpose of obtaining a sweeter nutriment, each under the command of its own leader; but first of all the scomber2342 appears, which is of a sulphureous tint when in the water, but when out of it resembles other fish in colour. The salt-water preserves2343 of Spain are filled with these last fish, but the tunnies do not consort with them.2344