There are many kinds of ornamental fish, and different fish have different methods of dividing male and female, but one thing will not change, that is, after entering the breeding period, the abdomen will expand is the female fish. In addition, many fish males are more brightly colored than females and look better.
1, guppy: Newborn guppy can not distinguish between male and female, usually grow to 1 month old, the fish will hair color, the first hair color is generally male fish. Moreover, you can also observe the belly of young fish, female fish can see the color inside, male fish is white belly. When they grow up, it is easier to distinguish them. The fins of male fish are very big and beautiful, while those of female fish are relatively short, and some have patterns. However, only female fish have fetal spots, male fish do not.
2. Goldfish: There are many ways to distinguish between male and female goldfish. First of all, look at the shape of the fish, usually the male is more slender, the female is fat and short. Secondly, you can see its tail, the male's tail is more robust, and wider. In addition, when they swim, males tend to be more agile and faster, while females are slower. If you can't tell by these, you can turn the fish over and look at the cloaca, which is long and narrow in the male and large and round in the female.
3. Koi: If you want to know whether the koi is male or female, you can observe its shape. The females are usually shorter and appear fuller, while the males are more elongated. In addition, the anterior part of the pectoral fin of male fish is more pointed, while that of female fish is more round. Observing the shape of genital pores from the side, the male fish is relatively flat or even concave, while the female fish is convex in the front.
