Algemene Tosakin discussie topic

Pearlscale, Tosakin, Lionchu, en meer [leden]
Gast

Bericht door Gast » 18-11-2011 22:00

Nog wat meer info van internet:

Though they were bred to be viewed in a pond from above, they are more delicate than other pond breeds. Care should be taken not to expose them to potential preditors, and to make sure there is nothing in the pond (or aquarium) which will damage their large caudal fin.
They are really terrible swimmers, and should be kept with their own kind or with other breeds that are bad swimmers as well, to ensure that they get their share of food. Obviously they need to be kept in ponds or pond-like aquariums with a lot of horizontal room, since their tails take up so much space. For obvious reasons, the pond should have little or no current. Despite the fact that they were bred for ponds, they do not tolerate cold temperatures as well as Common Goldfish.


Tosakin are metallic red, red and white or "uncoloured" iron-black. Often this variety can take a long time to decolour. Recently calico fish with Tosakin body conformations have been developed, but many purists have yet to recognize this coloration as a true Tosakin. The Tosakin is slow growing compared to most other breeds of fancy goldfish with a maximum attainable length of around eight inches.

The Tosakin was first developed by a lower-ranking Samurai in the Tosa Fief (now Kochi Prefecture), in Shikoku, Japan and probably did not reach other parts of Japan until the mid-twentieth century.
U.S. air attacks on Kochi during World War Two in 1945 and an earthquake in 1946 were believed to have wiped out the Tosakin variety. However, Mr. Hiroe Tamura, a Japanese hobbyist who had lost all of his fish, scoured the area and found six fish (2 breeders and 4 two-year olds) at a local restaurant called Kyousuirou.
He managed to trade a large bottle of Shouchuu (Japanese sweet-potato vodka) for the fish, and was able to successfully revive the Tosakins in Kochi. In 1969, the Japanese Government declared the Tosakin a Natural Treasure of Kochi Prefecture. In 1971 the breed had reached Tokyo, where a small group of young and avid enthusiasts painstakingly propagated and popularised the variety. The Tosakin Preservation Society was founded a few years later in Aichi Prefecture.


Kingyo
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Bericht door Kingyo » 18-11-2011 22:11

Zal binnenkort even wat overschrijven uit 1 van mijn boeken.
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Kingyo
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Bericht door Kingyo » 20-11-2011 09:57

Zoals beloofd:
The Tosa-kin (Tosa Goldfish)

The Tosakin is a uniquely Japanese fish which has arguably the most beautiful tail developed
in any goldfish variety. In general body characteristics it is like a Ryukin with the exception
of the caudal fins which are joined along their upper margins so it is a form of ‘web-tail’. The
caudals extend sideways with a characteristic upward curve of the mid-section; the joined
upper section tends to be more or less horizontal. This variety has declined in popularity,
perhaps because only about 30% of progeny reproduce the form of their parents. It is not an
easy type to breed, which perhaps explains why although it is greatly admired it is not seen
very often.




The Tosakin

The Tosakin or Goldfish of Tosa arose in the vicinity of Kochi City, as Tosa is now named.
There are two possible origins of this: the earlier is that it arose
from a cross between a Ryukin and an Osaka Ranchu in the late Edo period prior to 1868, the
later is by direct mutation from the Ryukin as reported by Matsui. The distinctive feature of
the Tosakin is its tail which is essentially a web-tail with a very characteristic shape. The free
(i.e. the lower) lobes of the caudal are extended laterally and curl forwards. In an outstandingly
good specimen the tail confi guration is very elegant indeed. Unfortunately the Tosakin
is not an easy fish to breed, rear or keep. Usually it is kept in shallow water and the tail conformation
is thought to produce so much drag in swimming that natural spawning can be difficult
and it may be necessary to hand spawn. It is difficult to understand quite why the Tosakin
should be such a difficult subject. The body conformation is Ryukin-like but less deep and it
seems therefore most probable that the mutation producing the caudal conformation has deleterious
pleiotropic effects. The fish created an enormous stir in the 1970s when introduced
to the West but nowadays it is rarely seen even in Japan.




The Tosakin standard

The Federation of British Aquatic Societies published in 1988 a standard for the Tosakin, one
of the very few which have been produced and which in the light of the variety’s fortunes was
produced in a spirit of optimism. The Tosakin is unquestionably an exceedingly beautiful fi sh
seen often in photographs but rarely in the fl esh. Many of those published are truly exquisite.
Unfortunately the fi sh is a very diffi cult subject indeed; it is not easy to keep and a problem
to breed, while individuals showing the full development of the very distinctive tail are very
rare.
In basic conformation the Tosakin is close to the Fringetail; body depth should be in excess
of 50% of the body length without a pronounced humpback. Among fancy goldfish it
is unusual in that possession of a web-tail is a sine qua non. The joined dorsal lobes extend
backwards along the upper surface, the trailing edge of the fused caudals then curves forward,
the point of greatest indentation of the caudals is approximately level with the caudal peduncle,
the upper portion of the ventral lobes continues the forward curve until the lower portion
is sharply recurved backwards towards the free end. The form of this curve is dependent
on the anatomical structure of the caudal peduncle; any imperfections and asymmetry in its
development would profoundly affect the carriage of the caudals.
It is tempting to link this variety with the Jikin as being particularly difficult; of the two
the Tosakin is the more exacting. It would probably be useful to examine and analyse carefully
the conditions under which this variety was developed in Kochi City (formerly Tosa)
and under which it has been produced in recent years. It is known that in China production of
some specific variants is only practically possible in very restricted geographical areas, the
reasons for which are not known but presumed to be environmental. In the West we experience
this problem in an even more severe form. To overcome it would require an extensive
(and probably expensive!) study of the development of characteristic features under varying
environmental conditions.
Due no doubt to the difficulty of reproducing the basic type, there has been very little attempt
to ring the changes regarding colour. Tosakins are self-coloured red or red and white
on the body sometimes with contrasting fin colour, for example, black.
An interesting variation is that the trailing edge of the caudals may be scalloped
instead of having the more usual straight edge.
Bron: Goldfish varieties and genetics; Joseph Smartt
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ZSjonnie
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Bericht door ZSjonnie » 20-11-2011 16:32

Dat zijn nu al 2 citaten zonder bronvermelding. Ik verwacht nog wel een bronvermelding erbij :wink:
Goudvis kwekers zijn het niet altijd eens met goudvis importeurs die het niet altijd eens zijn met goudvis houders.
Ieder heeft een ander doel, standpunt en perspectief. Hierdoor is een mening niet per se fout.

FancyGoldfish
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Bericht door FancyGoldfish » 20-11-2011 17:50

Misschien ook wel handig deze tekst door de Google tra slager te gooien. :D

Niet iedereen is goed in Engels.

Kingyo
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Bericht door Kingyo » 20-11-2011 18:37

@ Dino

Nee joh, als iemand het niet kan lezen kan die het toch zelf vertalen in google. :lol:
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Kingyo
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Bericht door Kingyo » 28-11-2011 20:40

christa41 schreef:de prefab is misschien 40cm diep en met sommige dagen bedoel ik zomerse dagen. ik begrijp dat tosakin de kroon van de goudvissen zijn. maar buiten met algjes enzo, zal vast ook goed zijn voor tosakin. alleen met fluwelen handschoentjes :lol:
Ik kan je alleen maar aanraden zoveel mogelijk te lezen over deze variant en nog geen koop te doen voordat je echt zeker weet waar je aan begint.
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christa41
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Lid geworden op: 28-11-2011 16:56

informatie gezocht voor tosakin verblijf

Bericht door christa41 » 04-12-2011 16:52

zoals sommigen van jullie weten, ben ik info aan het verzamelen omdat ik graag tosakin wil houden. ik heb vragen zoals, wat beter een laag aquarium als speciaalbak of een kleine binnenvijver? wat voor een filter kan ik gebruiken? welke voeding? verwarming? enz enz. wie heeft ideeen voor mij?
live isn't all gold. at least my fish are

ZSjonnie
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Bericht door ZSjonnie » 04-12-2011 17:36

Laag aquarium of lage kunststof bak maakt niet uit.
De vissen zijn gekweekt om van boven te bekijken, dus een lage kunststof bak werkt ook prima.
Bij deze vissen zou ik zelf geen filter gebruiken, maar de bak beluchten en om de 3 dagen een 80-100% waterverversing.
Wil je toch een filter gebruiken, zorg dan dat er een hele zwakke stroming staat.
Qua voer drijvend kwaliteitsvoer. Hikari, A-plus, etc.
Verwarming is in huis meestal niet nodig, tenzij je geen verarming gebruikt tijdens de koude dagen..
Goudvis kwekers zijn het niet altijd eens met goudvis importeurs die het niet altijd eens zijn met goudvis houders.
Ieder heeft een ander doel, standpunt en perspectief. Hierdoor is een mening niet per se fout.

christa41
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Lid geworden op: 28-11-2011 16:56

verversen

Bericht door christa41 » 04-12-2011 17:49

zou bij verversen een watervoorbereider moeten worden gebruikt? of volstaat het ouderwetse 24 uur beluchten?
live isn't all gold. at least my fish are

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