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Red Chicken replied, however, that they were a fish never eaten by sharks, and offered an explanation to which I listened politely, but with absolute unbelief. Imagine with what surprise I found Red Chicken's tale repeated in a book that I read some time later when I had returned to libraries. There is a fish, the Diodon antennatus, that gets the better of the shark in a curious manner.
The skin about the abdomen is much looser than that on the back; hence, during the inflation, the lower surface becomes far more distended than the upper; and the fish, in consequence, floats with its back downwards. Cuvier doubts whether the Diodon in this position is able to swim; but not only can it thus move forward in a straight line, but it can turn round to either side.
The fish, having remained in this distended state for a short time, generally expelled the air and water with considerable force from the branchial apertures and mouth. It could emit, at will, a certain portion of the water, and it appears, therefore, probable that this fluid is taken in partly for the sake of regulating its specific gravity. This Diodon possessed several means of defence.
The skin about the abdomen is much looser than that on the back; hence, during the inflation, the lower surface becomes far more distended than the upper; and the fish, in consequence, floats with its back downwards. Cuvier doubts whether the Diodon in this position is able to swim; but not only can it thus move forward in a straight line, but it can turn round to either side.
Allan of Forres, that he has frequently found a Diodon, floating alive and distended, in the stomach of the shark, and that on several occasions he has known it eat its way, not only through the coats of the stomach, but through the sides of the monster, which has thus been killed. Who would ever have imagined that a little soft fish could have destroyed the great and savage shark? March 18th.
Probably the little diodon of the Amazon has a similar means of revenging itself on the voracious monsters to whom it falls a prey; and though it might not be able to liberate itself through the scaly back of an alligator, it would inevitably kill the monster, or cause him such pain as to make him repent having swallowed so indigestible a morsel.
One day I was amused by watching the habits of the Diodon antennatus, which was caught swimming near the shore. This fish, with its flabby skin, is well known to possess the singular power of distending itself into a nearly spherical form.
The skin is also covered with small spikes, which, when thus inflated, become erect and pointed. It thus, though at first sight looking as helpless as can be, is well able to defend itself. The diodon has been known to be swallowed alive by a shark, in whose stomach it was found floating, probably supported by the air with which it had become inflated.
The little mamayacu, a species of diodon, which in the ocean attains a foot in length, is found in the Amazon three or four inches long, of a pretty green colour, banded with black. On being caught which it easily is it becomes in the hand as round as a ball. The natives, when a person gets corpulent, tell him that he has grown as fat as a mamayacu.
Despite all these defences, if the shark is fool enough to heed no warning and to eat Diodon, the latter puffs himself up and eats his way clean through the shark to liberty, leaving the shark riddled and leaky, and, indeed, dead. Should this still be doubted, my new authority is Charles Darwin.
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