1. Body type: First of all, the male and female koi can be distinguished from its body type. Generally speaking, if the same age of Koi, then the size of the female fish is relatively plump, while the male fish system is relatively slender. However, the juvenile stage is not so easy to observe, but the male fish grows faster during this stage.
2. Head: The head of male and female fish is also different. The head of the female fish is narrower and longer, while the head of the male fish has a protuberance, which is easier to observe.
3. Abdomen: Then there is the difference between the two. Generally speaking, the belly of the female fish is also relatively plump, and the belly of the male fish looks relatively flat. This aspect is easier to observe during the breeding season.
4. Pectoral fins: Then there is the difference between their fins, such as pectoral fins. If the female, then their pectoral fins are oval; If it is a male, then the pectoral fins appear to be more pointed.
5. Gonopore: When the length of Koi grows to more than 30 centimeters, you can judge their male and female by observing their gonopore. If the female fish, then its gonopore is convex, and relatively wide; If the male fish, then their gonopores are concave, looks like a line.
6, with or without white star chase: In the breeding period, they can be fished out to observe. If there are white stars in the fins and gills, it feels rough, that is a male fish; If it is smooth, it is a female fish.
Koi temperament is relatively mild, regardless of size or male and female, can be mixed culture.
