The first comprehensive English language inported Japanese reference book about the identification of Nishikigoi, their care, treatment, nutrition, and breeding.
Manual to Nishikigoi By Takeo Kuroki
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The author Mr Kuroki was the long time president of the Japanese Koi hobbyist organisation, the Zen Nippon Airinkai association. This text should be on every serious koi hobbyist's bookshelf.