COARSE FISH
Compared to what is known about the early part of the life history of
the _Salmonidæ_, our knowledge of coarse fish is small. Fortunately,
however, such lengthy and complicated proceedings as are necessary to
obtain a good stock of trout are not necessary to obtain a good stock of
coarse fish. If even a few rudd, perch, dace, pike, or carp are put into
water where they have a good supply of food to begin with, and which is
suitable otherwise for their well-being, the amateur's chief trouble
after a few years, if the water is not heavily fished, will be to keep
down the stock of coarse fish in proportion to the supply of food.
I have seen many cases where rudd, perch, dace and carp have increased
to an enormous extent from a few fish introduced into the water. Some
four years ago we put a few small rudd into a mill-pond at home,
thinking that the fry they produced would serve admirably as food to the
trout which also inhabited the pond. In about twenty months the pond was
full of small rudd, and last year we netted out many hundred, as the
water was terribly over-stocked with them. The same thing has happened
in almost every case which has come to my knowledge; that is, of course,
where the waters have been stocked with food, and suitable to the fish
introduced.
The way in which dace will increase when put into a suitable water is,
if possible, even more remarkable than what happens in the case of the
rudd. I will quote one instance, which proves this very conclusively. A
few years ago there were no dace in the Sussex Ouse. Pike fishermen,
however, used to bring live dace to use as baits. Some of these escaped,
or were set free by the fishermen at the end of their day's fishing, and
now the Sussex Ouse contains more dace for its size than any other river
I have ever seen.
While rudd thrive best in a pond or lake into which a stream flows, dace
require a river or stream to do well. They will, however, thrive and
increase rapidly in a river where trout are not a success. A muddy
bottom with occasional quickly running shallows, seem to constitute the
best kind of water for dace. The largest, and by far the best
conditioned dace I have seen, have come from the tidal parts of rivers,
where the water is brackish at high water. Dace from such a water have
also the advantage of being very good eating, as they have, as a rule,
not got the unpleasant muddy taste usual in this fish.
Perch and pike will thrive both in rivers and in ponds or lakes which
have a supply of water from a stream or from springs. They both increase
in numbers very rapidly, and when protected, are more likely to require
thinning down every few years, than artificial assistance from the
amateur.
The king-carp is the best fish for the amateur who wishes to obtain good
bottom fishing from an absolutely stagnant pond. This fish is much
bolder and a more free feeder than the common carp. It increases so
rapidly in numbers, and is a hard fighting and lively fish.
Most of the coarse fish deposit a much larger number of eggs than do any
of the _Salmonidæ_--that is to say, in proportion to their size. In
stocking a water which contains no fish, the amateur may wish to hurry
on the process of nature in the case of coarse fish; and, fortunately,
this is fairly easily managed. In the case of perch, rudd, pike, and
carp, but little change of water is required to hatch out the eggs. The
eggs of these fish take but a short time to hatch; and if they are
protected, and this protection is also given to the little fish for a
few weeks, it will generally be found that an amply sufficient result is
obtained. The eggs should be spread out carefully on wicker-work or the
lids of baskets and kept in the light. A trickle of water which is
sufficient to change the body of water in the pond in which the ova are
put will, as a rule, be enough. The amateur must be careful that the
pond in which he hatches the eggs does not contain any of the many
enemies I have described in former chapters. If it is at all possible to
protect the eggs and the little fish, it is best to hatch out the eggs
in the pond which it is intended to stock, for it is exceedingly
difficult to keep the newly-hatched fish in a rearing-pond on account of
their very small size. It will be necessary to use muslin or flannel
screens instead of perforated zinc. Care must be taken that there is not
too great a flow of water, as this will cause the little fish to be
drowned at the outlet screen.
APPENDIX
THE USE OF EARTH IN REARING PONDS
[From a correspondence upon the subject which appeared in _Land and
Water_]
SIR,--In your last issue I have read with pleasure the eminently
practical notes on fish culture by Mr. Charles Walker. He is perfectly
right in all he says with reference to the useful and preventive results
of the use of "common garden" earth, or vegetable mould in checking any
fungoid development, _Saprolegnia_ or other. It must, however, be
admitted that the said addition is not an element of beauty in a box;
therefore it should be avoided, or only used when necessity dictates.
However, the fry, when thoroughly restored to health, may be transferred
by muslin net to another box free from earth should it be necessary to
count out certain numbers for the satisfaction of customers' orders.
Again, the earth employed may, and in some waters does, give rise to
other ill effects on the health of the "fry" or young fishes. Affection
of the eye is not unheard of as the result of over-use of earth. Perhaps
the best way to obviate any trouble of this nature would be to pound and
dry the earth, and keep it in a canister or other closed vessel till
required for use. Spores of fungi are nearly, if not quite, omnipresent;
and their effects are so insidious that too many precautions cannot
well be taken to avert the introduction of "trouble" in the hatchery.
Indeed, were it not for the risks arising from attacks of fungi,
pisciculture, as now understood and carried on, would be an unalloyed
pleasure and unbounded success. We can practically hatch 995 out of
1,000 eggs, or thereabouts. It is the risks of rearing that stand in our
road, and these, as time goes on, and experience increases, must
diminish. There would appear, then, to be a good time coming for fish
culture, and those who earnestly follow it.
Practice is the only safe guide, as circumstances, geological, physical,
and meteorological so vary the conditions of works that no definite rule
of procedure will avail. Earnest work and close observation, combined
with ready resource, are the only safe guides to success. Troubles of
some sort are sure to supervene; the man who succeeds is he who can
anticipate, and so remedy them. To be always on the watch and notice the
first indication is a very safe maxim, more easy to inculcate than to
put in practice.
There can be no question but that the practical removal of difficulties
in the path of fish culture is work of the highest value, well worthy
the attention and acknowledgment of those in authority at Whitehall and
elsewhere at home, as has been the case abroad.
C. C. C.
SIR,--Your correspondent "C. C. C." in _Land and Water_ of last week
disagrees with the constant and free use of earth, which I had advocated
in my article on fish culture which appeared the preceding week.
Naturally one must admit that earth at the bottom of a pond is not so
great an element of beauty as is clean gravel, but the advantages are so
many, that beauty must give way to usefulness. Besides this, "C. C. C."
must know that it is almost impossible to keep the gravel clean enough
to look pretty, when the water is inhabited by a large number of little
fish which are being constantly fed. I cannot at all agree with his
advice that "earth should be avoided, or only used when necessity
dictates." I believe that one of the first principles of success in fish
culture is always to prevent any disease or mishap, rather than to wait
for, and then try to remedy it. Trout in their natural surroundings get
a dose of earth every time that there is a spate. It is very evident
that the earth contains some ingredients which are not only beneficial
but almost a necessity to the fish.
I have never heard of earth as an actual cure for "fungus" and should
hardly think that it is active enough. There is, however, no doubt that
it is one of the best preventatives to "fungus," for if it is properly
and freely used it stops all chance of any decomposing material being
exposed to the action of the water, and laying the fish open to the
chance of a great many evils.
If suitable earth is used once a week, and even oftener on occasions, it
can do no harm, and will keep the fish safe from a great many risks
besides doing them very material good. I do not of course mean that the
usual weekly dose should be a large one, as this would fill up the pond
before the end of the season, but that a small dose should be given
generally, and a large dose occasionally. I am quite sure, too, that
clean earth with some nice weeds growing in it, looks better than gravel
which is dirty. Gravel shows the dirt so much, that it is almost
impossible to keep it looking nice where there are many fish, and it
also gives the water free access to any decomposing matter.
I have never come across a case of disease caused by the use of earth,
and should like to hear the details of "C. C. C.'s" experiences with
regard to this matter.
CHARLES WALKER.
INDEX
Advantages of rainbow trout, 72-5
Air bubble in yolk sac, 40
Alders round rearing ponds, 32
at water side, importance of, 19
Alevins, 39-41
diseases of, 40-1
Alpine char, 78
American brook trout, 15
rearing of, 75-6
spawning of, 76
Aquatic creatures, serving as food for fish, 10-2, 62-6
Aquatic plants suitable for deep water, 13
suitable for margins, 13
Aquatic vegetation, importance of, 7
development of, 9
Arrangement of rearing boxes, 34
Artificial spawning of salmon, 83-4
_Asellus aquaticus_, 65
Black spotted trout of the Rocky Mountains, 76-8
Blue swelling, 41
Breeding char, difficulties in, 78-80
Breeding. (See Rearing.)
Brown trout, suitable water for, 14
Bullrushes, 13
_Byssus_, 37-8
Caddis-worms, 61-3
in hatching trays, 38-9
Carp, suitable water for, 18
Char, 16, 78-80
Alpine, 78
difficulties in breeding, 78-80
hatching out of, 78-9
introduction of, to the south, 80
kinds of, 78
rearing, 79-80
suitable water for, 16
Windermere, 78
Charring wood, importance of, 33, 50
Chub, suitable water for, 18
Coarse fish, 88-92
ova of, 90-1
Colorado River trout, 77
Columbia River trout, 77
_Conchifera_, 12
_Corixæ_, 10, 49, 63
Covers for rearing ponds, 31
Creatures, aquatic, serving as food for fish, 10-2, 61-6
Crowfoot, water, 13
Cure for fungus, 50
Cut-throat trout, 76-8
_Cyclops quadricornis_, 12, 48, 65-6
_Cypridæ_, 65-6
Dace, 18, 89-90
suitable water for, 18
_Daphnia pulex_, 12, 48, 65
Dead alevins, removal of, 41
Dead ova, removal of, 37
Difference between beetles and _Corixæ_, 11
Diseases of alevins, 40-1
ova, 37-9
_Dytiscus marginalis_, 11, 49, 58-60, 63
Earth in rearing boxes, 46, 93-6
doses of, in rearing pond, 54, 93-6
Effects of soft food on trout, 24
_Ephemeridæ_, 12, 64-5
larvæ of, 64-5
catching larvæ of, 64
Feeding of the fry, 42-9
Feeding yearlings, 67
Food, importance of, in waters, 5, 7
Fresh-water shrimp, 10, 49, 65
snails, 10-2
Friends and enemies of the fish, 58-66
Fry, feeding of, 42-9
separating large from small, 45
turning out of rearing box, 51-2
Fungus, 38-9
cure for, 50
_Gammarus pulex_, 10, 49, 65
Gold-fish, suitable water for, 18
Grannom, introduction of, 12
Grass round rearing ponds, 32
Grayling, possible harm done by, to trout, 16
suitable water for, 17
Great water moss, 13
Hatchery, suitable spot for, 21-6
Hatching out char, 78-9
ova of coarse fish, 91-2
Hatching trays, arrangement of, 34
caddis-worms in, 38-9
construction of, 32
placing ova in, 34-6
removal of, 42-3
shrimps in, 36
Herons, 60-1
_Hydrophilus piceus_, 59-60
Important points in rearing young trout, 56-7
Inlet to rearing ponds, 29-30
King carp, suitable water for, 18
Kingfisher, 49, 53, 60
Lake Tahoe trout, 77
Lakewort, 13
Leaf screen to rearing ponds, 29
Lobelia, water, 13
May fly, introduction of, 12
Moss, great water, 13
Mussels, 12
_Nautonecta glauca_, 10, 64
Natural food, importance of, 24
natural food for fry, 48-9
Netting for rearing ponds, 31
Ova beds, artificial salmon, 85
Ova, care of, 36-9
dead, removal of, 37
hatching of, 39
of coarse fish, 90-1
of sea-trout, 87
placing in hatching trays, 34-6
Perch, 19, 90-1
suitable water for, 19
Pike, 18-9, 90-1
Planting weeds in ponds, 7
in streams, 8
Ponds for yearlings, 70-1
Rainbow trout, 14-5, 72, 75
advantage of, 72-5
freedom from fungus, 73-4
rearing of, 72-5
suitable water for, 14
spawning time of, 21
Rearing, important points in, 56-7
Rearing box, arrangement of, 34
construction of, 31
cover for, 38, 49
Rearing char, difficulties in, 79-80
fry of salmon, 85-7
fry of sea-trout, 85-7
rainbow trout, 72-5
Rearing ponds, alders round, 32;
grass round, 32
construction of, 22, 27-9
covers for, 31
gravel in, 23
importance of allowing water to run through for some weeks, 21
inlet to, 29-30
netting for, 31
pipes to, 22, 27
removal of yearlings from, 70
separating fish in, 54-6
size of, 23-4
use of earth in, 54, 56, 93-6
vegetation round, 33, 55
willows round, 32, 55
Restocking, best time for, 24
Rio Grande trout, 77
Rudd, 17, 88-9, 91
suitable water for, 17
_Salmo irideus_, 14-5, 72-5
_fario_, 15
_mykiss_, 76-8
Salmon and sea-trout, 81-7
Salmon, artificial spawning of, 83-4
artificial ova beds, 85
mortality among ova and young fish, 81
rearing fry, 85-7
scale upon which rearing should be carried out, 83
success in artificial intervention in stock of, 81-2
Salt, as cure for fungus, 50
dose of, for yearlings, 69-70
_Salvelinus fontinalis_, 15.
(See American brook trout.)
_Saprolegnia_, 38-9.
(See Fungus.)
Sea-trout, ova of, 87
rearing fry of, 85-7
Sea-water as cure for fungus, 50
Separating yearlings, 68
Shrimp, fresh-water, 10, 49, 65
Shrimps in hatching trays, 36
Snails, fresh-water, 10-12
Soft food, effects of, on trout, 24
Spawning time of American brook trout, 76
Stocking waters with food, 7
Stonewort, water-, 13
Suitable fish and suitable water, 14
Trout, collecting wild ova of, 20
ova, management of, 20, 34-9
Turning fry out of rearing box, 51-2
out yearlings, 68-9
Varnishing wood, importance of, 33, 50
Vegetation, aquatic, importance of, 7
aquatic, development of, 9
importance of, at water side, 19
on banks of water, 9, 19
round rearing ponds, 32, 55
Water-boatman, 10, 64
beetles, 11, 58-60, 63
bugs, 63-4
celery, 13
cress, 13
crowfoot, 13
flea, 12, 48
lilies, 13
lobelia, 13
louse, 65
scorpion, 64
starwort, 13
Weeds, importance of, in waters, 7
planting in ponds, 7
in streams, 8
Willow round rearing ponds, 32, 55
at water side, 19
Windermere char, 78
Yearling trout, 56
Yearlings, feeding of, 67
removal of, from rearing pond, 70
separating, 68
turning out, 68-9
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End of Project Gutenberg's Amateur Fish Culture, by Charles Edward Walker