*Links are listed in alphabetical progression.
- Aichi, Komaki, Narita Fish Farm
- All Japan Nishikigoi Promotion Association
- All Japan Nishikigoi Promotion Association Niigata district
- INPC - International Nishikigoi Promotion Center
- IZUMISUISAN NISHIKIGOI CENTER (Only Japanese)
- Kinsai Publication (Only Japanese)
- Koi Quest
- KOI'S
- Koi TV®
- Kyoto Shiotani Koi Farm (Only Japanese)
- Matsui Ltd. (Only Japanese)
- My Koi Kichi
- NfN - Nishikigoi From Niigata
- Nishikigoi Conference (Only Japanese)
- Nishikigoi Sawada (Only Japanese)
- Sannichikai
- Shin Nippon Kyoiku Tosho Co.,Ltd (only Japanese)
- Tani Koi Farm (Only Japanese)
- Uosui (Only Japanese)
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