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Japanese Koi Fish Size and Basic Varieties

Japanese Koi Fish have many varieties, here are the 17 varieties accepted by the 20th All Japan Nishiki-Goi Show held in Tokyo in 1988. British and American dealers usually classify 13 varieties. At most shows there are arguments about the categorization of some Koi.

Japanese Koi Fish 8 Size System


  • Up to 18cm (7”)
  • Up to 20 cm (8”)
  • Up to 25 cm (10”)
  • Up to 30 cm (12”)
  • Up to 35 cm (14”)
  • Up to 40 cm (16”)
  • Up to 45 cm (18”)
  • Up to 50 cm (20”)
  • Up to 55 cm (22”)
  • Up to 60 cm (24”)
  • Up to 65 cm (26”)
  • Up to 70 cm (28”)
  • Up to 75 cm (30”)

15 Size System


  • Up to 15cm (6”)
  • Up to 80 cm (32”)
  • Over 80 cm (32”)
  • Up to 25 cm (9 ¾”)
  • Up to 35 cm (13 ¾”)
  • Up to 45 cm (17 ¾”)
  • Up to 55 cm (27 ½)
  • Up to 65 cm (25 ½)
  • Up to 75 cm (29 ½)
  • Over 75 cm (29 ½)







Commercial Varieties


Competition Categories




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