Various
Blackwood's Edinburgh Magazine — Volume 54, No. 333, July 1843
"I say, not with their silver scales, because no clear smolt is ever seen in the Tweed during the summer and autumnal months. As the spawning season in the Tweed extends over a period of six months, some of the fry must be necessarily some months older than the others, a circumstance which favours my supposition that they are constantly descending to the sea, and it is only a supposition, as I have no proof of the fact, and have never heard it suggested by any one. But if I should be right, it will clear up some things that cannot well be accounted for in any other mode. For instance, in the month of March 1841, Mr Yarrell informs me that he found a young salmon in the London market, and which he has preserved in spirits, measuring only fifteen inches long, and weighing only fifteen ounces. And again another, the following April, sixteen and a half inches long, weighing twenty-four ounces. Now, one of these appeared two months, and the other a month, before the usual time when the fry congregate. According to the received doctrine, therefore, these animals were two of the migration of the preceding year; and thus it must necessarily follow that they remained in salt water, one ten, and the other eleven months, with an increase of growth so small as to be irreconcilable with the proof we have of the growth of the grilse and salmon during their residence in salt water."—P. 36.
We are not entirely of Mr Scrope's opinion, that some salmon fry are descending to the sea during every month of the year; at least, we do not conceive that this forms a part of their regular rotation. But the nature of the somewhat anomalous individuals alluded to by Mr Yarrell, may be better understood from the following considerations. Although it is an undoubted fact that the great portion of parr descend together to the sea, as smolts, in May, by which time they have entered into their third year, yet it is also certain that a few, owing to some peculiarity in their natural constitution, do not migrate at that time, but continue in the rivers all summer. As these have not obeyed the normal or ordinary law which regulates the movements of their kind, they make irregular migrations to the sea during the winter floods, and ascend the rivers during the spring months, some time before the descent of the two-year-olds. We have killed parr of this description, measuring eight and nine inches, in the rivers in October, and we doubt not these form eventually the small, thin, rather ill-conditioned grilse which are occasionally taken in our rivers during early spring. But it is midsummer before the regularly migrating smolts reappear as grilse. However, certain points in relation to this branch of our subject may still be regarded as "open questions," on which the Cabinet has not made up its mind, and may agree to differ. Mr Scrope is certainly right in his belief, that, whatever be the range of time occupied by the descent of smolts towards the sea, they are not usually seen descending with their silvery coating on except in spring; although our Sutherland correspondent, to whom we have so frequently referred, is not of that opinion. It may be, that those which do not join the general throng, migrate in a more sneaking sort of way during summer. They are non-intrusionists, who have at first refused to sign the terms of the Convocation; but finding themselves eventually rather out of their element, on the wrong side of the cruive dyke, and not wishing to fall as fry into the cook's hands, have sea-ceded some time after the disruption of their General Assembly.
Even those smolts which descend together in April and May, (the chief periods of migration,) do not agree in size. Many are not half the length of others, although all have assumed the silvery coat. "I had, last April," Mr Young informs us in a letter of 3d June 1843, "upwards of fifty of them in a large bucket of water, for the purpose of careful and minute examination of size, &c., when I found a difference of from three and a half to six inches—the smallest having the same silvery coat as the largest. We cannot at all wonder at this difference, as it is a fact that the spawn even of the same fish exhibits a disparity in its fry as soon as hatched, which continues in all the after stages. Although the throng of our smolts descend in April and May, we have smolts descending in March, and as late in the season as August, which lapse of time agrees with the continuance of our spawning season. But in all these months we have an equal proportion (that is, a corresponding mixture) of large and small smolts. I have earnestly searched for smolts in the winter months, year after year, and I can only say that I have never seen one, although I have certainly tried every possible means to find them. I have seen fish spawning through the course of six months, and I have seen smolts descending through the same length of time. Our return of grilses, too, exactly corresponds with this statement. Thus a few descending March smolts give a few ascending May grilses; while our April and May swarms of smolts yield our hordes of grilse in June and July. After July, grilses decrease in numbers till October, in proportion to the falling off of smolts from May to August. At least these are my observations in our northern streams." They are observations of great value, and it is only by gathering together similar collections of facts from various quarters, that we can ultimately attain to a clear and comprehensive knowledge of the whole subject.
We gather from our most recent correspondence with Mr Shaw, (Letter of 8th June 1843,) that he does not regard the range in the spawning period to be followed by a corresponding range in the departure of smolts towards the sea, and in their return from it as grilse. He has found a considerable diversity of time in the assumption of the silvery coating even among individuals of the very same family. "I do not," he observes, "recollect an instance where there were not individuals of each brood reared in my ponds, which assumed the migratory coating several weeks before the brood in general had done so; and these individuals would have migrated accordingly, and reappeared as grilse all the sooner." As the hatching and growth of salmon smolts and other fish, is regulated in a great measure by the temperature of the water in which they dwell, it is very probable that ova deposited late in the season, (say the month of March,) may, in consequence of the great increase of temperature, be hatched much more rapidly than those spawned in mid-winter, and so, by the end of a couple of years, no great difference will exist between them. We remember that, in one of Mr Shaw's earlier experiments, it is stated that he took occasion to convey a few ova in a tumbler within doors, where the temperature ranged from 45° to 47°. They were hatched in thirty-six hours, while such as were left in the stream of the pond, in a temperature of 41°, did not hatch until the termination of seven subsequent days. The whole had been previously one hundred and six days in the water, under a considerably lower temperature.
Mr Shaw has frequently detected individual smolts, both of salmon and sea-trout, (though of the latter more particularly,) descending in some seasons as early as the end of March, and as late as the middle of June, and he has little doubt that some may make their way still earlier to the sea. These, of course, will be found in our tideways as small grilse, weighing one or two pounds, in April and May. The large parr, to which we have already alluded as occasionally met with in rivers, and which we regard as young salmon remaining (and in this forming exceptions to the normal rule) in fresh water throughout their third year, Mr Shaw, whose opinion we requested on the subject, coincides with us in thinking, "would, in all probability, be the first to quit the river after so long a residence there, when the season of migration approached. These, however, are not the only individuals of their kind which leave the river for the sea long before the month of May." A difference in the period of deposition will assuredly cause a difference in the period of hatching, and in this we agree with Mr Scrope; but we think that a late spawning, having the advantage of a higher temperature as the result of a more genial season, will be followed by a more rapid development, and so the difference will not be so great, nor expanded over so many months, as that gentlemen supposes. Finally, the vagrant summer smolts, to which we have before alluded, may consist of that small number of anomalous fry, which we know to assume the migratory dress and instinct soon after the completion of their first year.
Although the excellence of a salmon's condition is derived from the sea, and all its increase of weight is gained there, yet few of these fish remain for any considerable length of time in marine waters. By a wonderful, and to us most beneficial instinct, they are propelled to revisit their ancestral streams, with an increase of size corresponding to the length of their sojourn in the sea. Such as observe their accustomed seasons, (and of these are the great mass of smolts,) return at certain anticipated times. Their periods are known, and their revolutions calculated. Such as migrate at irregular or unobserved intervals, return unexpectedly at different times. Their motions seem eccentric, because their periods have not been ascertained.
But it is obvious that Mr Yarrell's diminutive examples already alluded to, could not have gone down to the sea with the great majority of their kind, during the spring preceding that in which they were captured; because, in that case, having remained a much longer time than usual in salt water, they would have returned as very large grilse instead of extremely small ones.
Mr Scrope informs us that the most plentiful season in the Tweed for grilse, if there has been a flood, is about the time of St Boswell's fair, namely, the 18th of July, at which period they weigh from four to six pounds. Those which don't leave the salt for the fresh water till the end of September and the course of October, sometimes come up from the sea for the first time weighing ten or eleven pounds, or even more.
"Some of them are much larger than small salmon; but by the term grilse I mean young salmon that have only been once to sea. They are easily distinguished from salmon by their countenance, and less plump appearance, and particularly by the diminished size of the part of the body next the tail, which also is more forked than that of the salmon. They remain in fresh water all the autumn and winter, and spawn at the same time with the salmon. They return also to sea in spring with the salmon. It seems worthy of remark, that salmon are oftentimes smaller than moderate-sized grilse; but, although such grilse have been only once to sea, yet the period they have remained there must have exceeded the two short visits made by the small salmon, and hence their superiority of size. When these fish return to the river from their second visit to the sea, they are called salmon, and are greatly altered in their shape and appearance; the body is more full, and the tail less forked, and their countenance assumes a different aspect."—P. 37.
We are glad to observe that in these opinions regarding the growth of grilse and salmon, our author conforms with, and consequently confirms, the ingenious and accurate experimental observations recently completed by Mr Young of Invershin.11
Of all those natural causes which counteract the increase of salmon fry, and consequently of grown grilse and adult salmon, Mr Scrope considers that the "furious spates" which so frequently occur in Tweed, are the most destructive. These not only put the channel in motion, but often sweep away the spawning beds entirely. Prior to the improvements in agriculture, and the amelioration of the hill pastures by drainage, the floods were much less sudden, because the morasses and swampy grounds gave out water gradually, and thus the river took longer to rise, and continued fuller for a greater length of time than in these degenerate days, to the increased delight of every acre-less angler.
"But now every hill is scored with little rills which fall into the rivers, which suddenly become rapid torrents and swell the main river, which dashes down to the ocean with tumultuous violence. Amidst the great din you may hear the rattling of the channel stones as they are borne downwards. Banks are torn away; new deeps are hollowed out, and old ones filled up; so that great changes continually take place in the bed of the river either for the better or the worse. When we contemplate these things, we must at once acknowledge the vast importance of Mr Shaw's experiments; for if ponds were constructed upon the Tweed at the general expense, after the model of those made by him, all these evils would be avoided. The fry might be produced in any quantities by artificial impregnation, be preserved, and turned into the great river at the proper period of migration. There might at first be some difficulty in procuring food for them; but this would be easily got over at a very small expense, and with a few adult salmon more fry may be sent to sea annually than the whole produce of the river at present amounts to, after having encountered the sweeping perils I have mentioned."—P. 43.
Our author then proposes that proprietors should call meetings for the purpose, and that parr, hitherto so named, should now, in their capacity of young salmon, be protected by law. He advises all who have an interest in the river, to consider the wisdom of mutual accommodation; the owners of the more seaward banks being dependent on the upper heritors for the protection of the spawning fish and fry, while they, on the other hand, are equally dependent on the former for an honest adherence to the weekly close-time.
But a thoughtful consideration of this portion of our subject would lead us into a somewhat interminable maze, including the policy of our ancient Acts of Parliament, and the nature of estuaries,—those mysteriously commingled "watteris quhar the sea ebbis and flowis,"—"ubi salmunculi vel smolti, seu fria alterius generis piscium maris vel aquæ dulcis, (nunquam) descendunt et ascendunt,"—and then the stake-net question stretches far before us, and dim visions of the "Sutors of Cromarty" rise upon our inward eye, and the wild moaning of the "Gizzin Brigs" salutes our ear, and defenders are converted into appellants, and suspenders into respondents, and the whole habitable earth assumes for a time the aspect of a Scotch Jury Court, which suddenly blazes into the House of Lords.12
That salmon return with great regularity to the river in which they were originally bred, is now well known. Mr Scrope, however, thinks that they do not invariably do so, but will ascend other rivers during spawning time, if they find their own deficient in bulk of water. Thus many Tweed salmon are caught in the Forth, (a deep and sluggish stream,) and a successful fishing there is usually accompanied by a scarce one in the Tweed. Yet we know that they will linger long, during periods of great drought, in those mingled waters where the sea "comes and gangs,"—as was well seen in the hot and almost rainless summer of 1842, when the Berwick fishings were abundant, but those of Kelso and the upper streams extremely unproductive. The established fact, however, that grilse and salmon, under ordinary natural circumstances, do certainly return to their native beds, is one of great practical importance, because it permits the plan of peopling barren rivers by the deposition of impregnated spawn carried from more fruitful waters. It ought to be borne in mind, however, in relation to this latter point, that these waters must possess, in a considerable measure, the same natural attributes which characterize the voluntary haunts of salmon. If they do not do so, although the fry bred there will in all probability return thither from the sea as grilse, yet the breeding process will be carried on at first feebly, and then inefficiently, till the species finally becomes extinct. The same observations, of course, apply to trout. It has been proposed, we believe by Sir W.F. Mackenzie of Gairloch, to apply the principle of one set of Mr Shaw's experiments to the improvement of moorland lochs, or others, in which the breed of trout may be inferior, by carrying the ova of a better and richer flavoured variety from another locality. Now, in this well-intentioned scheme, we think there is some confusion of cause and effect. It is the natural difference in food, and other physical features and attributes, between the two kinds of lochs in question, which causes or is intimately connected with the difference in the fleshly condition of their finny inhabitants; and unless we can also change the characters of the surrounding country, and the bed of the watery basin, we shall seek in vain to people "the margins of our moorish floods" with delicate trout, lustrous without any red of hue within, in room of those inky-coated, muddy-tasted tribes, "indigenæ an advectæ," which now dwell within our upland pools.
It has been asserted by some that salmon will dwell continuously, and even breed, in fresh water, although debarred all access to the sea. "Near Kattrineberg," says Mr Lloyd, in his work on the field-sports of the north of Europe, "there is a valuable fishery for salmon, ten or twelve thousand of these fish being taken annually. These salmon are bred in a lake, and, in consequence of cataracts, cannot have access to the sea. They are small in size, and inferior in flavour. The year 1820 furnished 21,817." We confess we cannot credit this account of fresh water (sea-debarred) salmon, but suppose there must be some mistake regarding the species. Every thing that we know of the habits and history, the growth and migrations, of these fish in Britain, is opposed to its probability. Mr Young has conclusively ascertained that, at least in Scotland, not only does their growth, after the assumption of the silvery state, take place solely in the sea, but that they actually decrease in weight from the period of their entering the rivers; and Mr Scrope himself, (see pp. 27, 30,) although he quotes the passage without protest, seems of the same opinion. Besides, with their irrepressible instinctive inclination to descend the rivers during spring when young, we don't believe that the cataract in question would prevent their doing so, although it might assuredly hinder their return in summer, in which case the Kattrineberg breed would soon become extinct, even supposing that they had ever had existence. The alleged fact, however, is well worthy of more accurate observance and explicit explanation than have yet been bestowed upon it by the Scandinavian naturalists.
We are informed that Mr George Dormer of Stone Mills, in the parish of Bridport, put a female salmon, which measured twenty inches, and was caught in the mill-dam, into a small well, where it remained twelve years, and at length died in the year 1842. "The well measured only five feet by two feet four inches, and there was only fifteen inches depth of water." We should have been well pleased to have been told of the size of the fish when it died, in addition to that of the prison in which it dwelt, for otherwise the fact itself is of less consequence.13 We presume its rate of growth would be extremely slow, although we do not agree with Mr Young in the opinion already quoted, that salmon actually decrease in dimensions on entering the fresh water. We doubt not they decrease in weight, and probably also in circumference; but their bones and organic structure are assuredly enlarged, and themselves lengthened, in such a way as to fit their general form for a rapidly increased development, so soon as they again rejoice in the fattening influences of the salubrious sea.
Our author next refers to a rather singular subject, which has not yet sufficiently attracted the notice of naturalists, and the phenomena of which (at least their final causes) have not been explained by physiological enquirers. That fishes assume, in a great degree, the colour of the channel over which they lie, is known to many practical observers. We have ourselves frequently frightened small flounders from their propriety with our shoe-points, while angling near the mouths of rivers, and so exactly did their colour accord with the shingle beneath our feet, that we could not detect their presence but by their own betraying movements. Such, however, as happened to glide towards, and settle on, a portion of the bed of different colour from the rest, continued perceptible for a short time; but they too seemed speedily to disappear, although we afterwards discovered that they had not stirred an inch, but had merely changed their tint to that of the particular portion of the basin of the stream to which they had removed. Every angler knows, that there is not only a difference in the colour of trouts in different streams, but that different though almost adjoining portions of the same river, if distinguished by some diversity of character in respect to depth, current, or clearness, will yield him fish of varying hue. Very rapid and irregular changes are also observable in their colours after death; and large alternate blotches of darker and lighter hues may be produced upon their sides and general surface, by the mode of their disposal in the creel. Dr Stark showed many years ago, that the colour of sticklebacks, and other small fishes, was influenced by the colour of the earthenware, or other vessels in which they were confined, as well as modified by the quantity of light to which they were exposed; and Mr Shaw has very recently informed us, regarding this mutability of the outer aspect of fishes, that if the head alone is placed upon a particular colour, (whether lighter or darker,) the whole body will immediately assume a corresponding shade, quite independent of the particular tint upon which the body itself may chance to rest. We know not to what extent these, and similar phenomena, are familiar to Sir David Brewster; but we willingly admit, that in order to attain to their clearer comprehension, the facts themselves must be investigated by one who, like that accomplished philosopher, is conversant with those branches of physical science to which they are related. They unfortunately lie beyond the range of our own optics, but Mr Scrope's practical improvement of the subject is as follows:—
"I would recommend any one who wishes to show his day's sport in the pink of perfection, to keep his trouts in a wet cloth, so that, on his return home, he may exhibit them to his admiring friends, and extract from them the most approved of epithets and exclamations, taking the praise bestowed upon the fish as a particular compliment to himself."—P. 56.
British legislators ought certainly to consider the recent completion of our knowledge both of salmon and sea-trout; and if they can make themselves masters of their more detailed local history, so much the better. Mr Home Drummond's is still the regulating Act of Parliament, and seems to have kept its ground firmly, notwithstanding many attempted alterations, if not amendments. In accordance with that Act, all our rivers north of the Tweed close on the 14th of September, and do not re-open till the 1st of February.14 This bears hardly upon some of our northern streams. In the Ness, for example, before the application of the existing laws, more fish were wont to be killed in December and January than during most other periods of the year.15 It appears to have been clearly ascertained that the season of a river (in respect to its being early or late) depends mainly upon the temperature of its waters. The Ness, which is the earliest river in Scotland, scarcely ever freezes. It flows from the longest and deepest loch in Britain; and thus, when the thermometer, as it did in the winter of 1807, stands at 20, 30, or even 40 deg. below the freezing point at Inverness, it makes little or no impression upon either lake or river. The course of the latter is extremely short. The Shin is also an early river, flowing from a smaller loch, though with a more extended course before it enters the Kyle of Sutherland, where it becomes confluent with the Oykel waters. It may so happen, that in these and other localities, a colder stream, drawing its shallow and divided sources from the frozen sides of barren mountains, may adjoin the lake-born river, and
"On that flood,
Indurated and fix'd, the snowy weight
Lies undissolved, while silently beneath,
And unperceived, the current steals away."
Now salmon don't like either snowy water, bridges of ice, or stealthy streams, but a bold, bright, expansive, unimpeded, and accommodating kind of highway to our inland vales. They instinctively regard a modified temperature, and a flowing movement, as great inducements to leave the sea in early winter, instead of waiting until spring; and, in like manner, they avoid "imprisoned rivers" until icy gales have ceased to blow. The consequences are, we may have an extremely early river and a very late one within a few hundred yards of each other, and both debouching from the same line of coast into the sea. Now, in the autumn of 1836, a bill was proposed and brought in by Mr Patrick Stewart and Mr Loch, to amend the preceding Act (9th Geo. IV.) which had repealed that of James I., (1424.) It proceeded on the preamble, that "whereas the sand acts have been found inadequate to the purposes for which they were passed, inasmuch as it is found that our close-time is not suitable for all the salmon fishings and rivers throughout Scotland, and it is expedient that the same should therefore, and in other respects, be altered, modified, and amended." It therefore enacted that different close-times shall be observed in different divisions of Scotland, the whole of which is partitioned into twelve districts, as specified in schedule A referred to in the bill. We do not know how or from whom the necessary information was obtained; but we doubt not it was sedulously sought for, and digested in due form. For example, the boundaries as to time and space of the second district, are as follows:—"From Tarbet Ness aforesaid, to Fort George Point, in the county of Nairn, including the Beaulie Frith and the rivers connected therewith, except the river Ness, from the 20th day of August to the 6th day of January, both days inclusive; and for the said river Ness, from the 14th day of July, to the 1st day of December, both days inclusive." This is so far well. But in the ninth district, the definition and directions are:—"From the confines of the Solway Frith to the northern boundary of the county of Ayr, from the 30th day of September to the 16th day of February, both days inclusive." Now most anglers know that the district thus defined, includes streams which vary considerably in their character, and cannot be correctly classed together. Thus the Doon, which draws its chief sources from numerous lakes among the hills, is one of the earliest rivers in the south-west of Scotland, clean fresh-run fish occurring in it by Christmas; while the neighbouring river Ayr, although existing under the same general climatic influence, produces few good salmon till the month of June. It is fed by tributaries of the common kind. The Stinchar, in the same district, is also a late river, being seldom worked by the tacksmen till towards the end of April, and even then few of the fish are worth keeping. Of course, it requires to be closed in September, although the fish are then in good case. These, and many other facts which might be mentioned, show the difficulty of legislating even upon the improved localizing principle which it has been attempted to introduce. However, the bill referred to, though printed, was never passed.
Since we have entered, inadvertently, into what may be called the legislative branch of our subject, we may refer for a moment to the still more recent bill, prepared and brought into Parliament by Mr Edward Ellice and Mr Thomas Mackenzie, and ordered to be printed, 11th May 1842. It is entitled, "a bill for the better regulation of the close-time in salmon fisheries in Scotland;" and with a view to accommodate and reconcile the interests of all parties, it throws the arrangement and the decision of the whole affair into the hands of the commissioners of the herring fishery. It enacts that it shall be lawful for these commissioners, upon due application by any proprietor (or guardian, judicial factor, or trustee) of salmon fishings, of the value of not less than twenty pounds yearly, in any of the rivers, streams, lochs, &c., or by any three or more of such proprietors possessing salmon fishings of the yearly value of ten pounds each, or of any proprietor of salmon fishings which extend one mile in length on one side, or one half mile on both sides of any river or stream, calling upon the said commissioners to alter the close-time of any river, stream, &c., to enquire into the expediency of such alteration. With that view, the are empowered to call before them, and examine upon oath or affirmation, all necessary witnesses, and to take all requisite evidence for and against the proposed alteration of the close-time; and upon due consideration of all the circumstances of the case, to determine that the close-time in such river, stream, &c., shall be altered, and to alter the same accordingly, and fix such other close-time as they shall deem expedient. Provided always that the close-time to be fixed by said commissioners, shall not in any case consist of less than one hundred and thirty-nine free consecutive days. Provision is also made for an alteration, on application and evidence as before, of any such legalized close-time, after the expiration of three years; all expenses incurred by the commissioners in taking evidence, or in other matters connected with the subject, to be defrayed by the proprietors. Permission may also be granted in favour of angling with the single rod, for fourteen days after the close. This bill, which we suspect it would have been difficult to work conveniently, was likewise laid upon the shelf.