THE WONDERS OF THE WATERS.

THE MANATEE, OR COW-FISH.

To maintain the claim of its ocean character, the Amazon possesses that huge, whale-like creature the manatee, or cow-fish, called by the Brazilians _peixe boi_, or _vacca marina_. It is generally about seven or eight feet long, though it attains a length of ten feet or more, and nine feet and upwards in girth. On the upper part the body is perfectly smooth, and of a lead colour. It tapers off towards the tail, which is flat, horizontal, and semicircular, without any appearance of hind-limbs. The head is in reality small, and the neck undistinguishable; though it has an enormous mouth, with fleshy lips like those of a huge cow, with an ugly countenance. On the lips are stiff bristles, while a few hairs only are scattered over the body.

Just behind the head are two powerful oval fins, beneath which, in the female, are the b.r.e.a.s.t.s. The ears are very minute holes, and the eyes are extremely small. The skin of the back is fully an inch thick; and beneath it is a layer of fat, also an inch or more in thickness. The fins of the fore-limbs consist of bones exactly corresponding to those of the human arm, with five fingers at the extremity--every joint distinct, although completely encased in its thick inflexible skin.

The manatee ranges from the mouth of the Amazon to the upper waters. It feeds on the gra.s.s growing on the borders of the lakes and rivers. It swims at a rapid rate, moved by the tail and paddles. The creature is hunted and killed by the natives with harpoons, the flesh being much sought after. The taste is somewhat between that of pork and beef. The natives dress it by cutting the meat into small pieces and sticking them on skewers, which they place in a slanting position over the flames to roast.

The female produces one, though sometimes two at a birth, which she holds in her paddles while giving suck. From twenty to twenty-five gallons of oil are obtained from each sea-cow. The poor manatee, little able to defend itself, has other enemies besides man. The jaguar lies in wait for it on the trunk of a tree overhanging the placid pool, and seizing it with his powerful claws as it swims by, holds it in a vice-like grasp, from which in spite of its strength it in vain endeavours to escape.

Those who have voyaged on the ocean, know the solemn feeling and the idea of vastness which is conveyed during a calm at night, when monsters of the deep are heard far and near as they come to the surface to inhale the air, or "blow," as it is called. The same feeling is experienced by the traveller up the Amazon when on board his montaria at anchor, when he hears the splashing and snorting sounds of its numerous inhabitants, as they rise through the mirror-like plain, in which countless thousands of bright stars are reflected. Here fresh-water dolphins roam in great numbers. In the Lower Amazon are two species; one of which,--the tucuxi,--when it comes to the surface to breathe, rises horizontally, showing first the back of its fin, and then, drawing an inspiration, generally diving down head-foremost; and another, called the bonto by the natives. When it rises, it first shows the top of the head, and then floating onwards, immediately afterwards dips its head downwards, its back curving over--exposing successively the whole dorsal ridge without showing the tail-fin; the well-known mode in which the sea-porpoise swims, which makes it appear to pitch head over heels. The natives regard the bonto or largest species with especial awe, and will never kill one voluntarily. Though their fat yields an excellent oil for lamps, they believe that blindness would result from its use.

The bonto is supposed to possess the characteristic of the malign water-nymphs of the Old World. They have a legend that a bonto was in the custom of a.s.suming the shape of a beautiful woman, with hair hanging loose down to her heels; who, going on sh.o.r.e, endeavoured to entice young men to the river. When any unhappy youth, smitten with her charms, was induced to follow her to the water's edge, she would grasp her victim round the waist, and plunging beneath the waves with a triumphant shriek, disappeared with him for ever.

PIRANHA.

There are several kinds of piranha, many of which abound in the waters of the Tapajos. The piranha, called also the caribe, is a kind of salmon (Tetragonopterus). They are caught with any kind of bait, their taste being indiscriminate, and their appet.i.te most ravenous. They frequently attack the legs of bathers near the sh.o.r.e, inflicting severe wounds with their strong triangular teeth.

THE DIODON.

The smaller inhabitants of the ocean are also represented in these fresh-waters. 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.

The ocean species, from having the skin about the abdomen looser than that above, floats, when it becomes distended with air, with its back downwards. It can thus move about as rapidly as in its usual position, by aid of its pectoral fins. By the movement of its jaws it makes a curious noise, and can give with its sharp teeth a severe bite. 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. It is a.s.serted that it also frequently eats its way, not only through the coats of the shark's stomach, but through the sides of the monster, which is thus killed. 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.

The magnificent pirarucu or anatto, of vast size, with its ornamental coat of mail, and broad large scales margined with bright red, peoples the waters in immense numbers. It is most frequently caught by the native fishermen; and when salted, forms the staple food of all cla.s.ses on the banks of the Lower Amazon. It swims at great speed, and attains the length of eight feet when full-grown, and five feet in girth. The Indian name of pirarucu is given to it from the native words _pira_, fish, and _urucu_, red; in allusion, says Mr Bates, to the red colour of the borders of its scales.

Among the other fish most frequently caught are the surubim and piraepieua (species of Pimelodus); very handsome fishes, four feet in length, with flat spoon-shaped heads, and prettily spotted and striped skins--two long feelers hanging from each side of their jaws like trailing moustaches.

THE ACARA.

The larger animals which inhabit the mighty river and the network of streams and pools which surround it on both sides, have been described; but numerous smaller creatures dwell within it, equally curious, and many totally unlike those to be found in other parts of the world. It has generally been supposed that, of all creatures, fish are the most dest.i.tute of parental feelings, and that from the moment the eggs have been deposited in the sand or mud, they are allowed to struggle into existence as best they can, to do battle with their foes, and the numerous dangers to which they are exposed. In the acara, however, we have an example of parental care and watchfulness unrivalled by any terrestrial animal.

The male of this curious fish has a conspicuous protuberance on the forehead, wholly awanting in the female and the young. Somehow or other, the eggs of the female are conveyed into the mouth of the male, the bottom of which is lined by them, between the inner appendages of the branchial arches, and especially into a pouch formed by the upper pharyngeals, which they completely fill. They are there hatched; and the little ones, freed from the egg, are developed until they are in a condition to provide for their own existence. In their head there is a special lobe of the brain, similar to those of the triglas, which sends large nerves to that part of the gills protecting the young, thus connecting the care of the offspring with the organ of intelligence. In this curious cavity of the father's head the young fish are found in all stages of development,--the more advanced, a quarter of an inch long, and able to swim about, full of life and activity. These appear to exist outside the gills, within the cavity formed by the gill-coverts and the wide branchiostigal membrane. The eggs remain in the back part of the gills.

The parent's care does not appear to cease even when the young are fully developed, but he allows them to swim in and out, and try their powers, if not to search for food; and when danger appears, opens his mouth, when they all swim back again in a shoal, for safety. The natives a.s.sert that some species, at all events, are not actually developed in the parent's head, but are laid and hatched in the sand, the male and female watching carefully over them; and that the father only takes charge of them when they are hatched, and receives them within his mouth to protect them from danger. From the observations of Professor Aga.s.siz, however, there is no doubt that in some species, at least, the whole process of development is begun and completed in the gill cavity.

The species which lay their eggs in the sand belong to the genera Hydrogonus and Choetobranchus. They build a kind of flat nest in the sand or mud, in which they deposit their eggs, hovering over them until the young are hatched.

Curious also is the little bill-fish--the lymn.o.bellus--with its long beak.

Another fish (the anojas), common in the Amazon, takes shelter--for it cannot be said to build a nest--in a hollow log. It belongs to the genus Auchenipterus. Numbers of this fish are found crowded in dead logs at the bottom of the river. One examined by the Professor, was filled with fish of all sizes, from those several inches long to the tiniest young. The fish were so dexterously packed into the log from one end to the other, that it was impossible to get them out without splitting it open, when they were all found alive and in a perfectly good condition. They could not have been jammed artificially into the hollow wood in that way without injuring them.

ANABLEPS.

We have heard of blind fish, but here is one--called by the Indians tralhote, and known to naturalists as the Anableps tetraophthalmus, signifying "four-eyed"--possessing four eyes. A membraneous fold, enclosing the bulb of the eye, stretches across the pupil, dividing the visual apparatus into the upper and lower half; a curious formation, suited to the peculiar habits of the anableps. These fishes gather in shoals on the surface of the water, their heads resting partly above and partly below the surface, and they move by a leaping motion somewhat like that of frogs on land. Thus, half in and half out of the water, they require eyes adapted for seeing in both elements, and the arrangement described just meets this want.

THE PARROT-FISH.

The birds of the air have, in this region, their representatives in the water. Among them is the curious and handsome pirarara, or parrot-fish.

It is a heavy, broad-headed creature, with a bony shield over the whole head. Its general colour is jet-black, its bright yellow sides deepening into orange here and there. The yellow fat of this fish has a curious property. The Indians a.s.sert that when parrots are fed upon it they become tinged with yellow, and they often use it to render their papagaios more variegated.

THE GYMNOTUS.

On the Amazonian waters is found the carapus, called by the Brazilians sarapo, belonging to the genus Gymnotus; though far smaller than the electric gymnotus. They are very numerous, and the most lively of the whole group. Their motions are winding and rapid, like those of the eel; but yet different, inasmuch as they do not glide quickly forward, but turn frequent somersaults, and constantly change their direction.

LOCALISATION OF FISH.

The researches of Professor Aga.s.siz prove that the localisation of species of fish in these waters is peculiarly distinct and permanent, their migrations being very limited--consisting chiefly in removing from shallow to deeper waters, and from these to shallow again, at those seasons when the range of the sh.o.r.e in the same water-basin is affected by the rise and fall of the river. Thus, the fishes found at the bottom of a lake covering, perhaps, a square mile in extent when the waters are lowest, will appear near the sh.o.r.es of the same lake when, at the season of high-water, it extends over a much wider area. In the same way, fishes which gather near the mouth of a rivulet at the time of low-water, will be found as high as its origin at the period of high-water; and those which inhabit the larger igarapes on the sides of the Amazon, when they are swollen by the rise of the river, may be found in the Amazon itself when the stream is low. There is not a single fish known to ascend from the sea to the higher courses of the Amazon at certain seasons, and to return regularly to the ocean.

The striking limitation of species within different areas does not, however, exclude the presence of certain kinds of fish simultaneously throughout the whole Amazonian basin. The piraracu, for instance, is found everywhere from Peru to Para; and so are a few other species more or less extensively distributed over what may be considered distinct ichthyological fauna. But these wide-spread species are not migratory.

They have normally and permanently a wide range--just as some terrestrial animals have an almost cosmopolitan character--while others are circ.u.mscribed within comparatively narrow limits.

Surprising indeed is the variety of species of fishes contained in the Amazonian basin. Professor Aga.s.siz, during his expedition, collected nearly two thousand, "for the most part," as he observes--and which is still more surprising--"circ.u.mscribed within different limits, from Tabalinga to Para, where the waters differ neither in temperature, nor in the nature of their bed, nor in the vegetation along their borders.

There are met with, from distance to distance, a.s.semblages of fishes completely distinct from each other."

Still more curious, perhaps, is the intensity with which life is manifested in these waters. All the rivers in Europe, from the Tagus to the Volga, do not nourish a hundred and fifty species of fresh-water fishes; and yet in a little lake near Manaos, called Lago Hyanuary, the surface of which hardly covers four or five hundred square yards, more than two hundred distinct species were discovered, the greater part of which have not been observed elsewhere.

GYMNOTUS, OR ELECTRIC EEL.

In the forest pools, as well as in the marshy ponds and slow-flowing rivers of the Llanos, numbers of huge serpentlike heads may be seen bobbing above the surface; or a huge, thick-bodied, yellow, snake-like creature may be caught sight of gliding through the water. It is the gymnotus electricus, or electric eel,--one of the many curious inhabitants of this region,--from two to five, and even eight feet in length. Though really a fish, it resembles the eel, but is stouter in its proportions. It is nearly equal in thickness throughout. It has a rude, depressed, and obtuse head, and a compressed tail. So great is the electric power it possesses, that when in full vigour it is able to kill the largest animal, when it can unload its electric organs in a favourable direction. All other fish, knowing by instinct the deadly effects of its stroke, fly from the formidable gymnotus. When fish are struck, or any animals which enter the pools inhabited by gymnoti--to drink, or cool their bodies, heated by the burning sun of the Llanos-- they become stupified, and thus easily fall a prey to the electrical tyrant.

The natives of Venezuela employ a cruel mode of catching the creatures, which, notwithstanding their nature, they use as food. Placing but little value on mules and horses, they collect a number of these animals, and, armed with harpoons and long slender rods, drive them with shouts towards a pool inhabited by gymnoti. The noise of the horses'

hoofs and the men's shrieks make the fish issue from the mud, when the huge, hideous creatures swim on the surface of the water, and crowd under the bellies of the horses and mules. Some of the Indians climb the trees; others stand round the margin, urging forward the unfortunate animals, and preventing them from making their escape. The fish defend themselves by frequent discharges of their electric batteries. At first they seem likely to prove victorious. Some of the quadrupeds sink beneath the violence of the invisible strokes which they receive from all sides, and, stunned by the force and frequency of the shocks, disappear under water; others, with their manes erect and eye-b.a.l.l.s wild with pain, strive to escape the electric storm which they have aroused, but are driven back by the shouts and long whips of the excited Indians.

The livid, yellow eels, like great water-snakes, swim near the surface and pursue their enemy. After the conflict has lasted a quarter of an hour or so, the mules and horses appear less alarmed. They no longer erect their manes, and their eyes express less pain and terror. The eel-like creatures, instead of advancing as at first, swim to the sh.o.r.e, when the Indians attack them with their harpoons, and by means of a long cord attached to it, jerk the fish out of the water, without receiving any shock, as long as the cord remains dry.

Such is the description given by Humboldt, a witness of the extraordinary scene. The employment of their electric powers is evidently spontaneous, and exhausts the nervous energy. Like voluntary muscular effort, it needs repose, and the creatures require an abundance of nourishment and rest before a fresh acc.u.mulation of electricity is produced.

In the dry season they form deep circular holes for themselves in the mud of water-courses, and marshes which remain filled with moisture, and they are thus able to support existence in their usual localities, while alligators and turtles have to retire to the larger pools or rivers. In the shallow ponds of the forest they are easily driven out with long poles.

Bates amused his native companions, who had thus caught some of the creatures, by showing them how the electric shock could pa.s.s from one person to another. They joined hands in a line, while he touched the biggest and freshest of the animals on the head with the point of his hunting-knife. He found, however, that the experiment did not succeed more than three times with the same eel when out of the water, for the fourth time the shock was scarcely perceptible.

The limbs even of the strongest man are benumbed, and he is struck down helpless, by a discharge from the battery of the gymnotus. The organs which produce this curious electrical effect are placed along the under side of the tail. They may be compared to a series of columns inclosed in a thin membrane packed closely together, which, consisting of a series of fiat discs, may be imitated by placing a number of coins with their discs parallel to each other, and with a bladder between each, separated by a gelatinous substance. These columns are technically called septa; and La Cepede calculates that two hundred and forty transverse membranes are packed in each inch, thereby giving to an electric eel eight feet in length an organ cavity of two hundred and forty-six square feet--an enormous extent, as may be supposed, of electricity producing surface. The whole apparatus is supplied with nerves which run through the entire length of the body.

STING-RAYS.

A fresh-water species of sting-ray is an inhabitant of the creeks and lagoons of stagnant water; and so infested are some of them with the creatures, that it is almost certain destruction to venture into them.

The sting-ray is circular and flat, with a tail above a foot in length, very thick at the base, and tapering towards the end. Near the middle, on the upper part, it is armed with a long and sharp-pointed sting, finely serrated on two sides, which the fish can raise or depress at will. When disturbed, by a quick movement of the tail out darts its sting towards the object, which it seldom fails to reach. The wound thus inflicted is so severe that the whole nervous system is convulsed, the person becoming rigid and benumbed in a few moments. Long after the most violent effects of the wound have subsided, the part affected retains a sluggish ulceration, which has often baffled the skill of the best surgeons.

They frequent the shallow banks of muddy pools, where they may be constantly seen watching for their prey, and, as if conscious of their powers, scarcely deign to move off when approached. They have their enemies in vultures and other birds of prey; and as they are considered fit for food, war with spear and talon is constantly waged upon them.

SERROSALMUS PIRAYA.

In the Orinoco another dangerous creature exists, called by the natives piraya, with a head shaped somewhat like a sabre. The lower jaw is furnished with a formidable pair of fangs, not unlike those of the rattlesnake. With these it inflicts a gash as smooth as if cut with a razor.