Koi fish in the market are mixed, so they need to be carefully selected. Because they are ornamental fish, if the selected koi species are not good, their life span and ornamental value will be affected. Therefore, when choosing, we should first choose their colors, which are red as blood, black as ink and white as cotton. The second is to choose the posture, and their posture should be good.

If their posture is out of balance, it is most likely due to swim bladder failure. This will endanger their health. Finally, choose the mental state. If the mental state is good, then they are healthy. You can sprinkle a lot of fish food into the fish tank and observe their feeding status. When choosing, choose to eat positive fish.

There are many varieties of koi, among which Dazheng tricolor, Showa tricolor, writing and red and white koi are fine ones. The first is red and white koi, which is the orthodox representative of koi. They come in two colors, red and white, and they have been awarded the Prime Minister's Award in Japan. Followed by Dazheng three-color koi, they have three colors, namely red, black and white. Their background color is white, and their heads have only erythema but no black spots. Then there are Showa three-color koi, which also have three colors, but unlike Dazheng three-color koi, their background color is black. Finally, I write koi fish, which show white triangular patches on their black background.