No More Full Varieties! Koi Color Chart Exploration (King of Goldfish)
The varieties of koi are very diverse, and according to domestic and international standards, they are generally divided into 13 major categories, and some people say 14 categories (this classification includes Akitsu Sumi as a separate major category). There are over 120 minor categories.
Koi pedigree chart

1, The Three Sacred Koi: Red, White, and Showa Three Colors
Red and White: Koi with a white background and red patterns

Great Showa Three Colors: Koi with a white background and red and black patterns

Showa Three Colors: Koi with a black background and red and white patterns

2, Write Koi
This category includes white write, red write, and yellow write. These varieties are characterized by large patches of black markings on a white, red, or yellow base
White write
Red write

Yellow write

3, Other-scaled Koi
Write koi with ink as the base, with spot patterns, and generally larger patches of ink. They have more power than other-scaled koi. Other-scaled koi have ink markings that are generally round or angular and condensed into spots
White other-scaled koi

Yellow other-scaled koi

Red other-scaled koi

4, Light Yellow
This category of koi is a primitive category of koi. Includes Deep Blue Light Yellow, and Meihai Light Yellow, etc.
5, Akitsu Sumi
This category of koi is a hybrid of light yellow and German mirror carp. Includes Akitsu Crimson, Yellow Akitsu Sumi, etc.

6, Embroidered Koi
This category of koi is a hybrid of light yellow and red and white. Includes Portuguese Embroidered, Black Embroidered, Blue Embroidered, Showa Embroidered, etc.

7, Crowned Koi
This category of koi is all koi with a red or other color patch on their head. There are many kinds. Crowned Red and White, Crowned Showa, Black Crowned, etc.

8, Gold and Silver-scaled Koi
This category of koi has shimmering scales, which is very beautiful. For example, Diamond Silver-scaled, with each scale inlaid like a diamond, and Silver-scaled Red and White, Silver-scaled Three Colors, etc.

9, Flower Patterned Skin Shiny Koi
The skin has a metallic sheen. Includes Chrysanthemum Water Golden, Great and Japanese Golden, etc.
10, Shiny Write Koi
The most representative is Peacock Koi. Has a metallic sheen and various patterns

11, Glossy Koi
This category of koi is golden and shimmering, such as Mountain Blow Golden, Red Gold, and some German varieties, such as German Golden, etc.

12, Mutant Koi
This includes many koi that have not yet been called a major category. Such as Tea Koi, Maple Leaf Koi, Kuroshio Koi, Shizakawa Koi, Shirobana Koi, etc. See the picture to see this complex category.