1, breeding period: goldfish into the breeding period after the male and female characteristics will be more obvious, breeders can observe their shape to judge. After entering the breeding season, the abdomen of the female fish will become slightly bulging, and it is relatively soft to touch with the hands, because there are fish eggs in their abdomen. When the male fish enters the breeding season, it will show the characteristics of "chasing stars". The breeder can observe whether there are white bumps on the gills and the first fin ray of the pectoral fin. This white spot only appears during the breeding season and disappears after the breeding season.
2. Non-breeding period: It is generally not easy to judge the male and female goldfish before the breeding period, and the breeder can distinguish them by their tails and colors. First of all, the tail of the male fish is relatively thick, and the shape is flat, while the tail of the female fish is relatively small. Secondly, the color of the male fish is relatively bright, while the female fish is relatively dim. If it is a different kind of goldfish, it is not accurate to judge by color, only the same kind of goldfish can be judged by color difference. Can male and
female goldfish can be polycultured because they have the same requirements for environment and food, and when they are polycultured together, they will breed by themselves, so that breeders can get more small fish.
