A Year at the Shore

by Philip Henry Gosse

The general form of the fish is beautifully symmetrical; it is nearly a rhomboid, with the two front sides slightly excavated, and the two posterior sides convex. At the point where these latter unite, there are two smaller fins (the ventrals), and the body is continued very slender to a considerable length, tapering to a point, near which two upright dorsals are placed. The pectorals, as in all this tribe, are of enormous size, forming the lateral angles of the rhomboid, and extending in front of the head to the tip of the snout.

The colours are beautiful, but not at all gaudy. A warm olive brown is the ground hue, on which numerous roundish black spots, with softly blending outlines, are set in symmetrical patterns, and there are also rows of pale spots. This combination of hues is elegant. The slender prolongation of the body is edged with a narrow stripe of pure white. The colour of the whole under surface is richly iridescent, like mother-of-pearl.

At present we see only a few of the curved spines appearing, chiefly in the vicinity of the eyes, which in the adult become so conspicuous and remarkable; being something like strong rose-spines, each set on an oval button of bone, imbedded in the skin.

STICKLEBACK.

Another draught presents us with the Fifteen-spined Stickleback,[61] a little fish, remarkable for its form, but much more so for its habits. It is ordinarily about five or six inches in length, very slender and lithe, from which circumstance, combined with a protrusion of the jaws, which gives it a sinister expression, it is on some parts of the coast called the Sea-Adder. The lower jaw projects considerably beyond the upper, which indicates that the fish habitually takes its food from a point above the level of its own body. The dorsal and anal fins are high and short, so as to form, when erected, nearly equal-sided triangles; but the former is preceded by fifteen minute sharp erectile spines, each of which has its own little membrane, and all together represent the spinous portion of the dorsal fin in such fishes as have but one, as the Blennies, or the first dorsal in such as have two, as the Weevers. The caudal is narrowly lozenge-formed, as ordinarily carried, but becomes fan-like when expanded. The colours are deep sepia, or olive-brown, cast into streaks and irregular clouds, on the sides, where they are interrupted by white, and by a rich golden yellow, that extends over the inferior surface: the dorsal and anal fins are white, each crossed by a broad conspicuous band of brown; the eyes have golden irides.

We frequently see this attractive little fish hovering about the long tufts of wrack and tangle that hang from perpendicular rocks, and from the quays and wharves of our harbours. It diligently hunts about for its minute crustacean prey, in picking off which it assumes all varieties of position “between the horizontal and perpendicular, with the head downward or upward,” thrusting its projecting snout into the tufted weed, and snatching its morsel with a sudden jerk.

It is, however, in its domestic relations that this little fish presents itself in the most interesting aspect. It was known ages ago to Aristotle, that some fishes are in the habit of forming nests, in which they deposit their eggs, and bring up their young with a parental care not inferior to that of birds. Until lately, however, this fact was supposed to be fabulous; and fishes were believed by the greatest masters of modern zoology to be utterly destitute of the parental instinct. Recent research has in this, as in so many instances, proved the exactitude of the old Stagyrite’s knowledge, and we now know that several fishes of different families nidificate. The Sticklebacks, most of which inhabit in common our marine and fresh waters, are remarkable for the manifestation of this faculty, as was first shown by Mr. Crookenden, of Lewisham, in 1834, and as has since been proved, with many interesting details, by Mr. A. Hancock and Mr. Warington. Our Sea-Adder, which is exclusively marine, was first ascertained to be a nest-builder by the late Dr. George Johnston, who mentioned the fact in the “Transactions of the Berwickshire Naturalists’ Club” in 1839. But the most interesting account is that of Mr. R. Q. Couch, who noticed the facts on the coast of Cornwall, and thus records them in a paper read before the Royal Institution of that county:—

ITS NEST.

“During the summers of 1842 and 1843, while searching for the naked mollusks of the county, I occasionally discovered portions of sea-weed and the common coralline (Corallina officinalis) hanging from the rocks in pear-shaped masses, variously intermingled with each other. On one occasion, having observed that the mass was very curiously bound together by a slender, silken-looking thread, it was torn open, and the centre was found to be occupied by a mass of transparent, amber-coloured ova, each being about the tenth of an inch in diameter. Though examined on the spot with a lens, nothing could be discovered to indicate their character. They were, however, kept in a basin, and daily supplied with sea-water, and eventually proved to be the young of some fish. The nest varies a great deal in size, but rarely exceeds six inches in length, or four inches in breadth. It is pear-shaped, and composed of sea-weed or the common coralline as they hang suspended from the rock. They are brought together, without being detached from their places of growth, by a delicate opaque white thread. This thread is highly elastic, and very much resembles silk, both in appearance and texture: this is brought round the plants, and tightly binds them together, plant after plant, till the ova, which are deposited early, are completely hidden from view. This silk-like thread is passed in all directions through and around the mass, in a very complicated manner. At first the thread is semi-fluid, but by exposure it solidifies; and hence contracts and binds the substance forming the nest so closely together that it is able to withstand the violence of the sea, and may be thrown carelessly about without derangement. In the centre are deposited the ova, very similar to the masses of frog-spawn in ditches.

“Some of these nests are formed in pools, and are consequently always in water: others are frequently to be found between tide-marks, in situations where they hang dry for several hours in the day; but whether in the water or liable to hang dry, they are always carefully watched by the adult animal. On one occasion I repeatedly visited one every day for three weeks, and invariably found it guarded. The old fish would examine it on all sides, and then retire for a short time, but soon returned to renew the examination. On several occasions I laid the eggs bare, by removing a portion of the nest; but when this was discovered, great exertions were made to re-cover them. By the mouth of the fish the edges of the opening were again drawn together, and other portions torn from their attachments and brought over the orifice, till the ova were again hid from view. And as great force was sometimes necessary to effect this, the fish would thrust its snout into the nest as far as the eyes, and then jerk backwards till the object was effected. While thus engaged it would suffer itself to be taken by the hand, but repelled any attack made on the nest, and quitted not its post so long as I remained; and to those nests that were left dry between tide-marks, the guardian fish always returned with the returning tide, nor did they quit the post to any great distance till again carried away by the receding tide.”