The haunts of the eel are among weeds, under roots, stumps of trees, in holes and clefts of the earth, both in the banks, and at the bottom in the plain mud, where they lie with only their heads out, watching for their prey; they are also to be found under great stones, old timber, about bridges, flood-gates, weirs, and also mills, except when the water is rendered thick by rains, for then they come out, and will bite eagerly. They are in best season from May until July: a running line should be used, which must be very strong, and the hook No. 3, or 4, with a plumb or pistol bullet upon it. They are to be angled for on the ground, and two or more rods may be employed (if ground bait be thought necessary, it should be the same as for the barbel); the prime bait is the lob-worm, and they bite eagerly all day, in dark cloudy weather, after showers, attended with thunder and lightning, when the water is high and discoloured; but those who venture upon night angling, will have far greater success when the weather is warm and the night dark. They are then to be angled for upon the shallows, where there is a current, or by the side or tail of a stream, with a sandy or gravelly bottom, with the bait on the ground; they will be felt to tug sharply when they seize the bait, give time (which is necessary both in day and night angling), and there will be no doubt of sport from night-fall until day-break, when they directly flee to their hiding places.
The largest eels are caught by night lines. It is of little consequence where they are laid, as they will succeed in streams (where the eels rove in search of prey), as well as in still waters, and they will take frogs, black snails, worms, roach, dace, gudgeon, minnows (which two last are best), loaches, bleaks, and millers’ thumbs. A sufficient quantity of links of twelve hairs should be doubled, and a hook tied to each link; these are to be noosed at proper distances to pieces of cord of fifteen feet long; bait the hooks by making an incision with the baiting needle under the shoulder and thrusting it out at the middle of the tail, drawing the link after it; the point of the hook should be upright towards the back of the baitfish; fasten one end to the bank or a stub, and cast the other into the water, but not to the extent of the line (as eels will run a little before they gorge): the lines should be taken up early in the morning; such of the lines as have eels at them will be drawn very tight. Dark nights in July, August, and September, are the best for this kind of fishing.
Another method of taking eels, when the water is clear and low, is called snigling, and is performed with a stick about a yard long, with a cleft at each end, and a strong needle well whipped to a small whipcord line from the eye down to the middle. In baiting, run the head of the needle quite up into the head of a lobworm, letting the point come about the middle; then put the point of the needle into the cleft at either end of the stick, and taking both stick and line together in one hand, put the bait softly into holes under walls, stones, &c., where eels hide themselves; if there be an eel there, he will take the worm and needle out of the cleft. Draw back the stick gently (having slackened the line), and give time for his swallowing the bait; then strike, and the needle will stick across his throat. Let him tire himself with tugging, previous to any attempt to pull him out, for he lies folded in his den, and will fasten his tail round anything for his defence. The largest eels are generally taken about the hollow stone-work of old bridges (the angler being in a boat), and are sometimes caught in considerable numbers.
A third plan for taking eels is by what is termed bobbing, which is best managed in a boat. This is done by taking a quantity of well-scoured lobworms; have a long needle, with three lengths of worsted slightly twisted together; put the needle lengthways through the worms, and draw them down on the worsted. When there is two yards thus prepared, then fold them up in links, and tie them to about two yards of good twine, and make a knot on it eight inches from the worms; and slipping a piece of lead, with a hole in it (weighing from a quarter to three quarters of a pound, according to the current fished in), down the line to the knot; fasten the line to a manageable pole, and let the lead lie on the bottom in thick, muddy water, when the tide runs up strong, or near the mouth of some river. When the eels nibble at the bait, they can be felt; give some little time before it is pulled up, which must be gently until near the surface, and then hoist out quickly. The worsted sticking in the eels’ teeth, prevents their loosening themselves until the line is slackened by throwing them into the boat, or on the ground. So soon as they are disentangled, throw the bait in again. Frequently great quantities are thus caught, especially of grigs. Eels are also to be snared in the same way as the pike, and in the fens numbers are speared by an instrument with three or four forks, or jagged teeth, which is struck at random into the mud.
The most extraordinary peculiarity in the natural history of the eel, is its double migration, one up and one down rivers, one from and the other to the sea; the first in spring and summer, and the second in autumn or early in winter. The first, of very small eels, which are sometimes not more than two or two and a half inches long; the second, of large eels, which sometimes are three or four feet long, and weigh from ten to fifteen, or even twenty pounds. There is great reason to believe, that all eels found in fresh water are the results of the first migration. They appear in millions, in April and May, and sometimes continue to rise as late even as July and the beginning of August. I remember this was the case in Ireland, in 1823. It had been a cold backward summer, and when I was at Ballyshannon, about the end of July, the mouth of the river, which had been in flood all this month, under the fall, was blackened by millions of little eels, about as long as the finger, which were constantly urging their way up the moist rocks by the side of the fall. Thousands died, but their bodies remaining moist, served as the ladder for others to make their way; and I saw some ascending even perpendicular stones, making their road through wet moss, or adhering to some eels that had died in the attempt. Such is the energy of these little animals, that they continue to find their way, in immense numbers, to Loch Erne. The same thing happens at the fall of the Bann, and Loch Neagh is thus peopled by them: even the mighty Fall of Schaffhausen does not prevent them from making their way to the Lake of Constance, where I have seen many very large eels.
There are eels in the Lake of Neufchatel, which communicates, by a stream, with the Rhine; but there are none in the Leman Lake, because the Rhone makes a subterraneous fall below Geneva; and though small eels can pass by moss or mount rocks, they cannot penetrate limestone, or move against a rapid descending course of water, passing, as it were, through a pipe. Again: no eels mount the Danube from the Black Sea; and there are none found in the great extent of lakes, swamps, and rivers, communicating with the Danube, though some of these lakes and morasses are wonderfully fitted for them, and though they are found abundantly in the same countries, in lakes and rivers connected with the ocean and Mediterranean. Yet, when brought into confined water in the Danube, they fatten and thrive there. As to the instinct which leads young eels to seek fresh water, it is difficult to reason; probably they prefer warmth, and, swimming at the surface in the early summer, find the lighter water warmer, and likewise containing more insects, and so pursue the courses of fresh water, as the waters from the land, at this season, become warmer than those of the sea.
Mr. J. Couch, (Lin. Trans. t. xiv. p. 70) says, that the little eels, according to his observation, are produced within reach of the tide, and climb round falls to reach fresh water from the sea. I have sometimes seen them, in spring, swimming in immense shoals in the Atlantic, in Mount Bay, making their way to the mouth of small brooks and rivers. When the cold water from the autumnal floods begins to swell the rivers, this fish tries to return to the sea; but numbers of the smaller ones hide themselves during the winter in the mud, and many of them form, as it were, in masses together. Various authors have recorded the migration of eels in a singular way,—such as Dr. Plot, who, in his History of Staffordshire, says, that they pass in the night, across meadows, from one pond to another: and Mr. Arderon, (in Trans. Royal Soc.) gives a distinct account of small eels rising up the flood-gates and posts of the water works of the city of Norwich; and they made their way to the water above, though the boards were smooth planed, and five or six feet perpendicular. He says, when they first rose out of the water upon the dry board, they rested a little—which seemed to be till their slime was thrown out, and sufficiently glutinous—and then they rose up the perpendicular ascent with the same facility as if they had been moving on a plane surface.—(Trans. Abr. vol. ix. p. 311.) There can, I think, be no doubt, that they are assisted by their small scales, which, placed like those of serpents, must facilitate their progressive motion: these scales have been microscopically observed by Leuwenhoek.—(Phil. Trans. vol. iv.) Eels migrate from the salt-water of different sizes, but I believe never when they are above a foot long—and the great mass of them are only from two and a half to four inches. They feed, grow, and fatten in fresh water. In small rivers they are seldom very large; but in large deep lakes they become as thick as a man’s arm, or even leg; and all those of a considerable size attempt to run to the sea in October or November, probably when they experience the cold of the first autumnal rains. Those that are not of the largest size, as I said before, pass the winter in the deepest parts of the mud of rivers and lakes, and do not seem to eat much, and remain, I believe, almost torpid. Their increase is not certainly known in any given time, but must depend upon the quantity of their food; but it is probable they do not become of the largest size from the smallest in one or even two seasons: but this, as well as many other particulars, can only be ascertained by new observations and experiments. Block states, that they grow slowly, and mentions, that some had been kept in the same pond for fifteen years.
As very large eels, after having migrated, never return to the river again, they must (for it cannot be supposed they all die immediately in the sea) remain in salt water; and there is great probability, that they are then confounded with the conger, which is found of different colours and sizes, from the smallest to the largest, from a few ounces to one hundred pounds in weight. The colour of the conger is generally paler than that of the eel; but, in the Atlantic, it is said, that pale congers are found on one side of the Wolf Rock, and dark ones on the other. The conger has breathing tubes, which are said not to be found in the other eel; but to determine this, would require a more minute examination than has yet been made. Both the conger and common eel have fringes along the air-bladder, which are probably the ovaria; and Sir E. Home thinks them hermaphrodite, and that the seminal vessels are close to the kidneys. I hope this great comparative anatomist will be able to confirm his views by new dissections, and some chemical researches upon the nature of the fringes and the supposed melt. If viviparous, and the fringes contain the ova, one mother must produce tens of thousands, the ova being remarkably small; but it appears more probable, that they are oviparous, and that they deposit their ova in parts of the sea near deep basins, which remain warm in winter. This might be ascertained by experiment, particularly on the coast of the Mediterranean. I cannot find that they haunt the Arctic Ocean, which is probably of too low a temperature to suit their feelings or habits; and the Caspian and Black Sea are probably without them, from their not being found in the Volga or Danube; these being shallow seas, are perhaps too cold for them in winter. From the time (April) that small eels begin to migrate, it is probable that they are generated in winter, and the pregnant eels should be looked for in November, December, and January. I opened one in December, in which the fringes were abundant, but I did not examine them under the microscope, or chemically. I trust this curious problem will not remain much longer unsolved.