A Nishikigoi's size is its length measured from the nose to the tail end, bearing no relation to its weight and body thickness. Bu is used for the size divisions.
The Size Divisions of koi at the ZNA All Japan Nishikigoi Show
Division Length of Koi
- 15 Bu
-
15 cm and under
- 20 Bu
-
over 15 cm up to 20cm
- 25 Bu
-
over 20 cm up to 25 cm
- 30 Bu
-
over 25 cm up to 30 cm
- 35 Bu
-
over 30 cm up to 35 cm
- 40 Bu
-
over 35 cm up to 40 cm
- 45 Bu
-
over 40 cm up to 45 cm
- 50 Bu
-
over 45 cm up to 50 cm
- 55 Bu
-
over 50 cm up to 55 cm
- 60 Bu
-
over 55 cm up to 60 cm
- 65 Bu
-
over 60 cm up to 65 cm
- 70 Bu
-
over 65 cm up to 70 cm
- 75 Bu
-
over 70 cm up to 75 cm
- 80 Bu
-
over 75 cm up to 80 cm
- 85 Bu
-
over 80 cm up to 85 cm
- 90 Bu
-
over 85 cm up to 90cm
- Over 90 bu
-
over 90 cm