Colors in Zen Koi are made up of combinations of Koi Base colour and pattern colour. the names of these seem to be inspired by Japanese colors, but combined to make new colour names.

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So for instance this Koi above has the base color of black (Kuro “くろ” in Japanese), and the pattern color of white (Shiro “しろ” in Japanese). These colour names are squished together to form “Kushiro”.

The Sutato part of the name refers to the pattern, which we’ll discuss on the patterns post.

You may wonder, what if this Koi had white base color with black pattern. In this case the color names are reversed “Shikuro”

There are 16 common color combinations:

White = Shiro (しろ)

White/White = Shishiro
White/Yellow = Shiniro
White/Red = Shidai
White/Black = Shikuro

Yellow = Kiiro (きいろ)

Yellow/White = Kishiro
Yellow/Yellow = Kiniro
Yellow/Red = Kidai
Yellow/Black = Kikuro

Red = Aka (あか)

Red/White = Akashiro
Red/Yellow = Akaniro
Red/Red = Akadai
Red/Black = Akakuro

Black = Kuro (くろ)

Black/White = Kushiro
Black/Yellow = Kuniro
Black/Red = Kudai
Black/Black = Kukuro

When you breed with another fish, the resulting offspring may have any combination of the parents’ base and pattern colors.
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So for this image above, you can see the potential offspring colors that are a combination of the base and pattern colors from the two parents.

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Levelling Up


Every time you eat a prey, you gain a little experience. With enough experience, you’ll gain a level, and when you do, you can use that experience to improve an attribute of your koi

Experience is shown in the circle around your level number. When it’s full, you will reach a new level and have Ability Points to allocate to one of your attributes.


So the example below, I have 3 ability points that I can put into Agility, Speed or Rarity.


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Here’s my understanding of what the attributes do, and please add to the comments if you have any thoughts on this.

  1. Agility
    This stat modifies how quickly you can turn, and if improved will help you catch prey much faster. This is what I recommend you put the majority of ability points in at the beginning. Agility also improves the “lunge” when you try to catch a prey.
  2. Speed
    Simply – how fast you can swim. At the beginning, most prey will be faster than you, so you’ll need to get this up to a reasonable level to make your life easier.
  3. Rarity
    This seems to improve the chance that your rare color will be passed on to your offspring. So if you’ve got a koi with a common color, you can prioritize the other two stats over this. However, if you find a rare color, you can spend all of your points on this stat to make sure you get lots of rare-colored offspring.

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