The Dace, Leuciscus argenteus, is a slight silvery minnow, found generally in the middle of the stream, where the current is most rapid, and frequently confounded with the last named.
The Shiner, Leuciscus crysoleucas, is a soft-scaled and tender fish, the victim of its stronger neighbors, found in all places, deep and shallow, clear and turbid; generally the first nibbler at the bait, but, with its small mouth and nibbling propensities, not easily caught. It is a gold or silver bit that passes current in the river, its limber tail dimpling the surface in sport or flight. I have seen the fry, when frightened by something thrown into the water, leap out by dozens, together with the dace, and wreck themselves upon a floating plank. It is the little light-infant of the river, with body armor of gold or silver spangles, slipping, gliding its life through with a quirk of the tail, half in the water, half in the air, upward and ever upward with flitting fin to more crystalline tides, yet still abreast of us dwellers on the bank. It is almost dissolved by the summer heats. A slighter and lighter colored shiner is found in one of our ponds.
The Pickerel, Esox reticulatus, the swiftest, wariest, and most ravenous of fishes, which Josselyn calls the Fresh-Water or River Wolf, is very common in the shallow and weedy lagoons along the sides of the stream. It is a solemn, stately, ruminant fish, lurking under the shadow of a pad at noon, with still, circumspect, voracious eye, motionless as a jewel set in water, or moving slowly along to take up its position, darting from time to time at such unlucky fish or frog or insect as comes within its range, and swallowing it at a gulp. I have caught one which had swallowed a brother pickerel half as large as itself, with the tail still visible in its mouth, while the head was already digested in its stomach. Sometimes a striped snake, bound to greener meadows across the stream, ends its undulatory progress in the same receptacle. They are so greedy and impetuous that they are frequently caught by being entangled in the line the moment it is cast. Fishermen also distinguish the brook pickerel, a shorter and thicker fish than the former.
The Horned Pout, Pimelodus nebulosus, sometimes called Minister, from the peculiar squeaking noise it makes when drawn out of the water, is a dull and blundering fellow, and like the eel vespertinal in his habits, and fond of the mud. It bites deliberately as if about its business. They are taken at night with a mass of worms strung on a thread, which catches in their teeth, sometimes three or four, with an eel, at one pull. They are extremely tenacious of life, opening and shutting their mouths for half an hour after their heads have been cut off. A bloodthirsty and bullying race of rangers, inhabiting the fertile river bottoms, with ever a lance in rest, and ready to do battle with their nearest neighbor. I have observed them in summer, when every other one had a long and bloody scar upon his back, where the skin was gone, the mark, perhaps, of some fierce encounter. Sometimes the fry, not an inch long, are seen darkening the shore with their myriads.
The Suckers, Catostomi Bostonienses and tuberculati, Common and Horned, perhaps on an average the largest of our fishes, may be seen in shoals of a hundred or more, stemming the current in the sun, on their mysterious migrations, and sometimes sucking in the bait which the fisherman suffers to float toward them. The former, which sometimes grow to a large size, are frequently caught by the hand in the brooks, or like the red chivin, are jerked out by a hook fastened firmly to the end of a stick, and placed under their jaws. They are hardly known to the mere angler, however, not often biting at his baits, though the spearer carries home many a mess in the spring. To our village eyes, these shoals have a foreign and imposing aspect, realizing the fertility of the seas.
The Common Eel, too, Muraena Bostoniensis, the only species of eel known in the State, a slimy, squirming creature, informed of mud, still squirming in the pan, is speared and hooked up with various success. Methinks it too occurs in picture, left after the deluge, in many a meadow high and dry.
In the shallow parts of the river, where the current is rapid, and the bottom pebbly, you may sometimes see the curious circular nests of the Lamprey Eel, Petromyzon Americanus, the American Stone-Sucker, as large as a cart-wheel, a foot or two in height, and sometimes rising half a foot above the surface of the water. They collect these stones, of the size of a hen's egg, with their mouths, as their name implies, and are said to fashion them into circles with their tails. They ascend falls by clinging to the stones, which may sometimes be raised, by lifting the fish by the tail. As they are not seen on their way down the streams, it is thought by fishermen that they never return, but waste away and die, clinging to rocks and stumps of trees for an indefinite period; a tragic feature in the scenery of the river bottoms worthy to be remembered with Shakespeare's description of the sea-floor. They are rarely seen in our waters at present, on account of the dams, though they are taken in great quantities at the mouth of the river in Lowell. Their nests, which are very conspicuous, look more like art than anything in the river.
If we had leisure this afternoon, we might turn our prow up the brooks in quest of the classical trout and the minnows. Of the last alone, according to M. Agassiz, several of the species found in this town are yet undescribed. These would, perhaps, complete the list of our finny contemporaries in the Concord waters.
Salmon, Shad, and Alewives were formerly abundant here, and taken in weirs by the Indians, who taught this method to the whites, by whom they were used as food and as manure, until the dam, and afterward the canal at Billerica, and the factories at Lowell, put an end to their migrations hitherward; though it is thought that a few more enterprising shad may still occasionally be seen in this part of the river. It is said, to account for the destruction of the fishery, that those who at that time represented the interests of the fishermen and the fishes, remembering between what dates they were accustomed to take the grown shad, stipulated, that the dams should be left open for that season only, and the fry, which go down a month later, were consequently stopped and destroyed by myriads. Others say that the fish-ways were not properly constructed. Perchance, after a few thousands of years, if the fishes will be patient, and pass their summers elsewhere, meanwhile, nature will have levelled the Billerica dam, and the Lowell factories, and the Grass-ground River run clear again, to be explored by new migratory shoals, even as far as the Hopkinton pond and Westborough swamp.
One would like to know more of that race, now extinct, whose seines lie rotting in the garrets of their children, who openly professed the trade of fishermen, and even fed their townsmen creditably, not skulking through the meadows to a rainy afternoon sport. Dim visions we still get of miraculous draughts of fishes, and heaps uncountable by the river-side, from the tales of our seniors sent on horseback in their childhood from the neighboring towns, perched on saddle-bags, with instructions to get the one bag filled with shad, the other with alewives. At least one memento of those days may still exist in the memory of this generation, in the familiar appellation of a celebrated train-band of this town, whose untrained ancestors stood creditably at Concord North Bridge. Their captain, a man of piscatory tastes, having duly warned his company to turn out on a certain day, they, like obedient soldiers, appeared promptly on parade at the appointed time, but, unfortunately,