Research sources
- All Japan Nishikigoi Promotion Association: Variety - variety names and Nishikigoi classification reference.
- Zen Nippon Airinkai: Varieties of Nishikigoi - show appreciation groups and major variety categories.
- Kyorin Hikari: Nishikigoi variety guide - Japanese-language variety reference and koi education context.
- Matsuda Koi Farm: variety introduction - Japanese-language descriptions of major varieties.
Image credits
- Kohaku image: Martin Kammerer, CC BY-SA 4.0, via Wikimedia Commons.
- Taisho Sanke image: Paulman, CC BY-SA 3.0, via Wikimedia Commons.
- Showa image: Aquafanatic, CC BY-SA 3.0, via Wikimedia Commons.
- Yamabuki Ogon image: Benutzer:Fehlwort, CC BY-SA 3.0, via Wikimedia Commons.
- Tancho image: Maxikoi, CC BY-SA 3.0, via Wikimedia Commons.
- Utsurimono image: Maxikoi, CC BY-SA 3.0, via Wikimedia Commons.
- Bekko image: Maxikoi, CC BY-SA 3.0, via Wikimedia Commons.
- Asagi image: Maxikoi, CC BY-SA 3.0, via Wikimedia Commons.
Images from professional breeders, Japanese associations, and dealer websites are not copied unless the license or permission allows reuse. Future sales pages should use original product photos or photos supplied with explicit permission.