1. Look at the body shape: If the male and female fish are basically the same age and they are all adults, they can be distinguished from their body shape. If they are male fish, they will look slender; If it is a female fish, then their body looks plump.

2. Look at the appearance: There are great differences in appearance between male butterfly carp and female butterfly carp. First of all, from the head point of view, the head of male fish will have a protruding state compared with that of female fish, but sometimes it is not easy to observe. In addition, their pectoral fins are also different. The pectoral fins of male fish are pointed, while those of female fish look round.

3. Look at the breeding period: If both male and female fish are in the breeding period, they can be distinguished from two aspects. From the abdomen, if the abdomen is larger, it is the female fish. From the perspective of genitals, the genitals of female fish are convex, while those of male fish are sunken.

Raising butterfly koi generally requires a larger fish tank so that it can move. It is best not to mix it with other fish, because its fin tail is very big and easy to be bitten. If it is bitten, it will not look good. This kind of fish is similar to other koi fish, and it belongs to wide-temperature fish, but it is best to keep a slightly higher temperature in artificial breeding, so that it grows fast and is not easy to get sick.