1. Head differences: The head size of the female and male fish is different. When they are breeding, the male fish should always hold the eggs in his mouth. So the male's head is much bigger than the female's, and his tip is longer.
2. Gills difference: The gills of the female fish have a "a" shaped mark. The shape of the male's gills is irregular. If you don't look carefully, you can't see its mark in the shape of "a".
3. Difference in body length: At the time of juvenile, the body length of female and male fish is basically the same. When the fish grew older, the growth rate of the female fish slowed down significantly. So the male fish is longer than the female fish at the same age.
4. Scale differences: male scales are 80% gold, most of the scales are very bright. The scales of female fish are blue, and only half of the scales are bright. So a fish with bright gold scales is a male, and a fish with blue scales is a female.
5. The difference between crossing the back: The speed of crossing the back of the male fish is very fast. The speed of female fish crossing the back is slow, and the degree of crossing the back is not as great as that of male fish.
In the juvenile period, the territorial consciousness of female and male fish is not strong, and they can be raised together. As they grow up, their sense of territory will gradually increase. Especially adult females and males, they will fight for territory. Because the female fish is smaller than the male fish, it is often vulnerable in the fight and easily injured. Therefore, it is not recommended to keep female fish and male fish together.
