Blackwood's Edinburgh Magazine — Volume 54, No. 333, July 1843

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.

Although, as we have said, salmon soonest ascend the warmest rivers, they are alleged to spawn earliest in the colder ones. Thus Mr Scrope informs us, that in the shallow mountain streams which pour into the Tay, near its source, the fish spawn much earlier than those in the main bed of that magnificent river, and he quotes the following sentiments of the late John Crerar, head fisherman and forester to the Duke of Athole, on the subject:—

"There are," said John, "two kinds of creatures that I am well acquainted with—the one a land animal, the other a water one—the red-deer and the salmon. In October the deer ruts, and the salmon spawns. The deer begins soonest, high up among the hills, particularly in frosty weather; so does the salmon begin to spawn earlier in frosty weather than in soft. The master hart would keep all the other harts from the hind, if he could; and the male salmon would keep all the other males from the female, if he was able."—P. 60.

We do not think, however, that Mr Scrope's comparative reference to the upper and lower portions of the Tay affords a satisfactory or conclusive test. The higher parts of almost all rivers (including, their tributaries) constitute the favourite spawning places, from other causes than "by reason of the cold;" and the question should be tried, not by comparing two different districts of the same river, but all the portions of one river, with the entire course of another of dissimilar character. The exceptive clause in Mr Loch's proposed act in flavour of the river Ness, certainly stood upon the supposition of that river being an early one for the breeding salmon, as well as the new-run winter fish; for it enacts not only that the Ness should open more than a month earlier than its neighbours, but also that it shall close more than a month before them. This latter restriction would of course be useless and impolitic, if the parent fish were not conceived to be about to spawn. But it should also be borne in mind, that the same causes (such as the extent and depth of feeding lakes) which produce a higher temperature in winter, cause a lower one in summer and the earlier part of autumn, and that shallow upland streams are warmer during the latter periods than those which flow from deeper and more affluent sources. We believe that the fish of all rivers spawn soonest on the higher portions of their water courses, whether these be comparatively warm or cold. The earliest individuals are in general such as have escaped the nets and other accidents below, and have made their watery way in good time to proper spawning places. In several rivers with which we are acquainted, a great majority of the breeding fish ascend in August and September. But many of those which make their appearance in July, would be early spawners if they were allowed to escape the various dangers which beset their path in life—almost all the salmon of that month being captured by one means or another. Mr Young, in our MS. notes already quoted, states, in regard to the range of the breeding season, that he has seen salmon perfectly full of spawn, ascending the rivers in October, November, December, January, and February. Now the fish of the last-named month may have spawned as late as March, although our correspondent adds that he has never seen fish on the spawning beds later than February, nor earlier than September. He has seen them in the act of spawning in these and all the intermediate months.

As we have said above, the greater part of these breeders ascend in August and September, and the throng of the spawning process takes place in November and December. The earlier spawning begins in September with only a few pairs, generally grilse; and from that period the numbers increase till the first week of December, when the operation has attained its height. It then gradually decreases until February, when perhaps only a few pairs are seen at work. Mr Young informs us that sea-trout are seen spawning a week earlier than grilse, and grilse a week earlier than salmon. He does not mean that all grilse spawn before salmon begin, but that they are observed working a week before the latter have commenced.

Mr Shaw informs us, (in his last letter,) that it is an exceedingly rare occurrence to find an unspawned fish in the rivers of Dumfriesshire in the month of March. On one occasion, however, about twenty years ago, he observed a female salmon spawning in the Nith about the 10th or 12th of March, but unaccompanied by any male. He can also call to mind a pair of salmon having been observed spawning in the Ettrick so late as Selkirk March fair, which is held during the first week of April. This, however, we believe to be a very rare occurrence, notwithstanding Mr Scrope's statement, that he has in the Tweed "caught full roaners as late as May." These seem to be anomalous or accidental instances, and we are not aware that any evidence has been brought forward to prove that they still seek the spawning beds in pairs at that period, or produce what may be called autumnal fry.

The usual spawning period in the south-west of Scotland extends from about the middle of November till the middle of February; but the busiest months of that period are December and January, when the salmon spawn in great numbers in the Nith, about Drumlanrig. From the circumstances of the largest salmon visiting the rivers at that season, Mr Shaw is induced to think that they are likewise the oldest; and that, as they increase in years, they desire to remain the longer in the sea, visiting the fresh waters only during the breeding season. The spawning period of sea-trout, he informs us, is from about the middle of October until the middle of December, the principal period being the whole of November, when the various streams and tributaries are taken possession of both by sea-trout and herling, spawning in deep or shallow water, according to their individual size.

But in reference to the point in question, that cold accelerates the spawning process, let us take for a moment the general basin of the Oykel waters into view. We know that for several seasons back, the earliest spawning in that quarter has occurred in the Carron, in September. Now, it is certain, that during that month the Carron waters are warmer than those of the Shin. So also the Oykel (properly so called) is itself two degrees warmer in October than the Shin, and yet the latter is the later of the two. It thus appears that warmth may be advantageous both as inducing early spawning in autumn, and an early entrance of fresh-run fish in winter; although a single river may not possess both attributes for the reason hinted at—the deepest waters, though protected from winter's cold, being also screened from summer's heat. Mr Scrope may therefore be regarded as right in his facts as to the earlier season of the upland streams, although his theoretical explanation of them is not conclusive.

The lateness of the spawning season in the Shin may, in some measure, be owing to the early breeding fish going up into the loch, from whence, after a time, they fall back upon the spawning places in the fords of the river. The same thing happens in the lower regions of the Tay—the fish fall back from the loch, and the ford between Taymouth Castle and Kenmore is by far the latest in that river. Salmon have been seen to spawn there in February. In regard to the general influence of the atmosphere, we may here remark that frosty weather is good for spawning; because the fish go then into the deeper or central portions of the fords, by which procedure the spawning beds are never dry,—whereas, in time of spates, salmon are apt to deposit their spawn along the margins, and thus the roe is frequently destroyed by the subsiding of the waters.

However, the real importance of an early river has little or no connexion with the periods of the spawning process; because it is not so much the breeding fish that are of individual value in winter, as those which, having no intention or requirement to spawn until the following autumn, enter the fresh waters because they have already completed the days of their purification in the sea. Although, when viewed in the relation of time, they may seem to form the continuous succession of spawning fish which have come up gravid from the ocean during the later months of autumn, they are in truth rather the avant-couriers of the newer and more highly-conditioned shoals which show themselves in early spring. We believe that fresh-run fish may be found in all our larger rivers during every month throughout the year, though we cannot clear up their somewhat anomalous history, nor explain why the breeding season, as among land creatures of identical natures, should not take place more uniformly about the same time. It is by no means improbable, however, that, as grilse seek our fresh waters at different periods from adult salmon, so salmon of a certain standing may observe different periods of migration from those of dissimilar age.

If, as many suppose, the earliest fish are those which have soonest spawned during the preceding autumn, and have since descended towards and recovered in the sea,—then a precocious spawning would necessarily lead to the speediest supply of clean fish in mid-winter; but the fact referred to has not been ascertained, and it may therefore still be as reasonably alleged that the winter fish (an opinion supported by the fact of their unusually large size) have continued in the sea since spring. At least a majority of them, (for they differ somewhat in their aspect and condition,) instead of having spawned soonest in autumn, have probably rather spawned last of all during the preceding spring, and so required for their recovery a corresponding retardation of their sojourn in the sea. The reasons why grilse seldom show themselves till the summer is well advanced, are very obvious, now that we have become conversant with their true history. They were only smolts in the immediately preceding spring, and are becoming grilse from week to week, and of various sizes, according to the length of their continuance in the sea. But they require at least a couple of months to intervene between their departure from the rivers in April or May, and their return thither;—which return consequently commences, though sparingly, in June, and preponderates in July and August.

But we are making slow progress with our intended exposition of Mr Scrope's beautiful and instructive volume. Although salmon and salmon streams form the subject and "main region of his song," he yet touches truthfully, albeit with brevity, upon the kindred nature of sea-trout, which are of two species—the salmon-trout and the bull-trout. The fry of the former, called orange fins, (which, like the genuine parr, remain two continuous years in the river,) greatly resemble the young of the common fresh-water trout. "Like the grilse, it returns to the river the summer of its spring migration, weighing about a pound and a half upon an average."—P. 63. We think our author rather over-estimates their weight at this early period. Herlings (for so they are also named on their first ascent from the sea) rarely weigh one pound, unless they remain for a longer time than usual in salt water. In this state they bear the same relation to adult sea-trout as grilse do to salmon, and they spawn while herlings. They afterwards increase about a pound and a half annually, and in the summer of their sixth year (from the ovum) have been found to weigh six pounds.16 Whether this is their ordinary ultimate term of increase, or whether, having every year to pass up and down the dangerous, because clear and shallow waters, exposed to many mischances, and, it may be, the "imminent deadly breach" of the cruive-dyke, and thus perish in their prime, we cannot say: but this we know, that they are rarely ever met with above the weight of six or seven pounds.