1, size: First of all, can be judged by the size of the goldfish. If the male fish, then their size will generally be relatively long and thin; Females tend to be shorter and rounder.
2. Appearance: The appearance of male goldfish and female goldfish is quite different. The first is the genitals, the female fish's genitals look relatively large, the shape is round, and convex; The male's genitalia are long, narrow, small, and appear to be concave. Then there is the caudal peduncle, which is smaller in females and larger in males. Then there are their pectoral fins, which are short and rounded in shape; The pectoral fins of male fish are longer and more pointed.
3. Color: You can also judge by observing their color. The color of the female fish is relatively dull and generally has no pattern. The male fish is more colorful and may have patterns. In the breeding season, this color difference is more obvious.
4, activity: male goldfish and female goldfish activity is not the same. The activity of male fish is generally higher, more active in the water, swimming faster; The activity of female fish will be slightly lower, and they are not very fond of swimming. They can suddenly approach the fish tank to observe their activity.
Male goldfish and female goldfish can be mixed, goldfish is a relatively mild temperament of goldfish, generally speaking, will not fight. As long as there are not too many goldfish in the tank and they are provided with enough food and oxygen, there will be no problem of fighting.
