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Doitsulover: Guess we got so focused on Goshiki that your question about Kujacku was overlooked. And, I have to apologize for causing you to think that crossing two Kujacku will not produce Kujacku. From what I have read, there would be Kujacku among the fry of such a cross. There would also be far more koi of all sorts. Many koikeepers assume that if two fish of a particular variety are bred, that the offspring will be entirely or predominantly of that variety. That is seldom the case. Even with a genetically refined variety, like Kohaku, many of the offspring will be solid colored in red or white.
It is interesting that you ask about both Kujacku and Goshiki, because I do not think of them as having anything in common, except some Asagi blood in the background. However, a year or so ago I obtained a copy of Masayuki Amano's book "Live Jewels: General Survey of Fancy Carp", which was published in 1968 (English version) and was surprised to see Kujacku referenced as a metallic Goshiki. I think of Kujacku as "Matsuba Hariwake", but if a person considers a Goshiki as having a white ground as Bern suggests, then Amano's allusion to metallic Goshiki starts to make sense.
As for the origin of Kujacku, Dr. Kuroki in Modern Nishikigoi writes that the variety was created by Toshio Hirasawa in 1960 by breeding a female Shusui that had a metallic back with a male Matsuba Ogon and a male Hariwake. Dr. Kuroki summarized the variety as follows:
"In short, Kujaku Ogon are the Hikarimono of fully-scaled Mame-shibori Goshiki."
This description of the origin of Kujacku is confusing to me, because Dr. Kuroki elsewhere in his book states that the Matsuba Ogon was first produced in 1960 by Eizaburo Mano. Obviously, if it was first created in 1960 by Mano, it could not have been one of the male parents used by Hirasawa in 1960. Ogon are known to grow quickly, but that is a bit too precocious I think.
Dr. Kuroki seems to have considered Kujacku as necessarily being metallic red or orange on silver, because he separately describes "Yamabuki Hariwake Matsuba" as a different variety within Hariwake, while Kujacku is described separately from Hariwake. I think of them as color variants of the same fish, but apparently Dr. Kuroki had a different appreciation of them.
Matsuba-goi originated in the deep past of koi, apparently through crosses of Asagi with benigoi, kigoi and shiromuji. So, the Matsuba Ogon was a metallic version. Lots of Asagi genes in the equation to produce Kujacku.
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