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BRISTOL BLUE SHUBUNKIN
This is our very own strain of fish, developed some 70 years ago by careful line breeding here in Bristol. We describe below the standard to which the breeders aspire, the quality of present-day fish, the inside story of developing it and its history over the last 100 years.
The Bristol shubunkin was exported to Japan in about 2004/05 where it is known as the sierironisiki after the Japanese dancing fan of similar shape to the heart-shaped tail of the Bristol shubunkin.
The Bristol shubunkin standard is as follows:
- Depth of body to be between 3/7ths and 3/8ths of body length
- Pectoral and pelvic fins to be paired, dorsal and anal fins to be single
- Caudal fin to be single and well spread with rounded contours
- Body to be smooth not angular
- At least 25% of the body to be blue
- Minimum body length to be 7.5 cm (3 inches)
Only calico fish to be shown.
The fish should be bright and alert with the caudal fin carried high without
drooping or overlapping. The body should be long and slender with a smooth outline.
Quality fish will have a high colour intensity with the pigment extending into
Colour: a show fish will have a blue background with patches of violet, red,
orange, yellow and brown, spotted with black.
The ideal profile is illustrated below:
Young fish, 8 months old
These are fine young fish, shown at BAS 2000. You could be forgiven for thinking
that the tail in the picture of the standard (above) is an exaggeration, but
these young fish demonstrate that it is real.
Good mature fish, illustrating the range of colours and patterns in calico
fish. The individual at bottom-right could ideally have a larger tail, but possesses
a very fine blue background colour.
Click on Further Images for more photographs. Then take a look at our streaming
video clip of this lovely fish under About Us.
There are some 50 hobbyists in Britain breeding the Bristol shubunkin, and
present-day strains, some of which go back 25 years or more in the hands of
the same breeders, are thought to have good colour, although some are a little
dark overall; some strains are thought to lack a large enough tail, others are
slightly deep in the body. All strains these days, though, have good strong
tails that do not droop with age.
Hobbyists new to breeding initially acquired 10-20 young fish from established
breeders to get them going, and now run breeding stocks of some 10-30 individuals
with an even balance between the sexes. Naturally, breeders retain their very
best stock, so initial acquisitions, although from good local strains, had room
for improvement, and from time to time breeders have acquired further stock
from either local breeders or other societies for outcrossing to improve their
strain; outcrossing has more often than not proven advantageous.
Selecting for desired characters
About 1,000-5,000 fry are typically produced per breeder in a season and about
10-25 are retained, giving a ratio of about 200:1 (i.e. 1 in 200 is very good
in quality and kept for future showing and breeding). A number of breeding schemes
are followed, eg father-with-granddaughter, mother-with-son, but always the
best fish are used, sometimes irrespective of relationships.
The colour and overall body shape are the first characters to improve as a
result of selective breeding, and the large tail is the hardest character to
achieve. It is not necessarily the rule that good fish produce good young, which
can be a puzzle, and improved characters, if not carefully maintained, will
deteriorate - in fact the fish, if left to themselves in large numbers, would
steadily revert to wild type. Some find that improvements in the tail lead to
deepening of the body, and it is a skill to achieve a good balance of characters
in accordance with the standard.
Preparations for the breeding season start in February-March, some leaving
it until April. The sexes are separated so that pairing is controlled. Some
pairs are left to spawn naturally, whilst others are hand-spawned (i.e. the
owner aids the release of eggs and spawn by gentle pressure above the cloaca),
particularly when, for example, it is wished to breed more than one male with
a certain female. Adult fish are fed flake, pellets, earth worms, frozen bloodworms
and other frozen foods to condition them. Fry are fed on brine shrimp for the
first 2-3 weeks, then live daphnia and crumbled flake; some breeders have lost
fry when weaning them off brine shrimp onto crumbled flake, and live daphnia
proves very successful in averting such losses.
(selecting individual fish for retention or not) starts when the fry are 4 weeks
old, when the pinks and bronzes are removed, together with deformed fish - bronzes
are fish that have reverted to wild type colouration (a picture of a bronze
is on the right), and pinks are fish with no colour at all.
A second cull is carried out when the fry are 8 weeks old and a third at 12
weeks, selecting for colour and body shape, and further culls in late Autumn
to early Spring the following year, when the quality of the tail is becoming
Fish are kept in tanks in fish houses (greenhouses plumbed for easy water changes)
and ponds. Neither are heated at any time. Some breeders change 100% of tank
water over the course of each week, using either all tap water or a 50-50 mix
of tap water and pond water (which some feel is advantageous). Local water in
the Bristol area is now very good, and it is usually left for a few days rather
than treated; the water is slightly alkaline (pH of about 7.7) and medium-to-hard.
Bristol shubunkins suffer little in the way of diseases, parasites or other
problems (compared with some other types of fancy goldfish), and are very hardy,
becoming very tame. Some live for 15 years or so.
Most breeders' objective for improving the Bristol shubunkin is to advance
the size and shape of the tail closer to the standard.
The first shubunkins are said to have appeared in Japan around the year 1900;
they were a multi-coloured fish which, due to the efforts of American breeders,
produced offspring with long, pointed, single tails ('comet' shubunkins).
Arrival in Britain
In Britain, it was quickly realised that these shubunkins were ideal coldwater
fish, being both colourful and hardy. Members of BAS took a keen interest in
this fish, and in 1934 they produced the Bristol shubunkin standard. The outline
drawing of the type was a composite of many fish and the result was regarded
as an ideal that we should seek to achieve. The first schedule for points allowed
55 for colour; as a result, fish of inferior shape sometimes came higher in
the awards simply because of their better colouring.
In 1938, BAS revised its pointing system to allow 35 for colour, with 5 extra
points for body, tail, and fins, plus a bonus of 5 points for soft gill plates.
Over the years, preferences have been shown for different aspects of this fish
and at one time all-blue fish were the fashion. Other societies have sometimes
attempted variations on the Bristol standard (for instance, there is the London
shubunkin, which is short-finned like the common goldfish), but the true
Bristol shubunkin has remained a firm favourite above all imitations.
Leading to the modern standard
In 1979, after 50 years of shubunkin breeding by our members and friends around
the country, a slight revision to the standard was again made to reflect the
preferences of the vast majority of the exhibitors at our annual shows and to
keep pace with the progress made by breeders. This revised standard (described
and illustrated above, at the head of the page) includes a pointing system giving
equal weighting to body, fins, colour, condition/deportment and special characteristics,
which will ensure the future of our Bristol shubunkin as a well-balanced fish.
It is certain that this active, beautiful fish of infinite colour variations
is as popular amongst British goldfish keepers today as it ever was in the past.
For many hobbyists, the breeding of this variety has become a full-time interest
and almost a way of life, being responsible for friendships between persons
living many miles apart.
© Bristol Aquarists' Society