Plutarch, De sollertia animalium
Goodwin, Ed.

But let these examples suffice to show, that fish are not altogether strangers to mankind, nor altogether void of human affection. But for a great and common demonstration [p. 197] of their unmixed and natural understanding, we find that there is not any fish that swims, unless they be such as stick and cling to the rocks, which is so easily taken by men, as asses are seized by wolves, bees by bee-eaters, grasshoppers by swallows, serpents by harts. And these last are therefore called ἔλαφοι, not from their swiftness (ἐλαφρότης), but from a faculty which they have of drawing serpents to them (ἕλκειν ὄφεις). So sheep call the wolf by the sound of their feet, and the panther allures to her paws both apes and other creatures by the fragrant smell of her body. But so suspicious is the sense of all water animals, and so watchful are they to avoid all baits and treacheries against them, by reason of their extraordinary cunning, that fishing thereby becomes no easy or single labor, but a toil that requires various instruments and many tricks of human cunning and deceit. This is apparent from examples near at hand. For no man desires an angling-rod too thick, though strong enough to hold against the twitches of the fish when taken; but rather they require it slender, lest by casting too great a shadow upon the water, it should frighten the suspicious creature. In the next place, they never knit too many knots in the line, but make it as smooth as may be, for that would too much discover the deceit; and then for the hairs which are next the hook, they endeavor to get the whitest they can meet with; for so, by reason of the likeness of color, they lie the more easily concealed in the water. Therefore some there are who, wrongly expounding the following verses of Homer,¹

She to the bottom quickly sinks, like lead,
Which fixt to horn of rustic ox descends,
² And brings destruction to the greedy fish,

believe that the ancients made use of ox-hair for their lines with which they angled, alleging that κέρας then signified [p. 198] hair,—from whence κείρασθαι, to be shaved, and κουρά, shaving,—and that κεροπλάστης in Archilochus signified one who takes delight in trimming and decking the hair. But this is an error. For they made use of horse-hair, more especially that of male horses. For mares, by moistening their tails with their urine, render the hair weak and brittle. Though Aristotle will not allow any thing to be said in all this that requires such extraordinary subtlety. Only he says, that the lower piece of the line was fortified with a little hollow piece of horn, lest the fish should come at the line itself and bite it off; moreover, that they made use of round hooks to catch mullets and tunnies, in regard they had but small mouths, for that they were afraid of a straight hook. He also further says, that the mullet many times suspecting the round hook, will swim round about it, flapping the bait with his tail, and then turning round, secures to himself so much as he has broken off. Or if he cannot do that, he shuts his mouth close, and with the extremities of his lips nibbles off some part of the bait.

The fish called labrax behaves himself more stoutly than the elephant; for when he perceives himself struck with the hook, without assistance he sets himself at liberty, widening the wound by flinging his head to and fro, and enduring the painful twingings of the hook, till he have freed himself from it with the loss of his flesh. The sea fox (or the fish called alopex) seldom bites, but avoids the deceit; but if he chance to be taken, he presently turns the inside of his body outward. For by reason of the strength and moisture of his body, he has a peculiar faculty to turn it so that, the inside coming to be outermost, the hook falls off. These things demonstrate understanding, and a subtle and extraordinary use of it in the nick and juncture of time.