Crayfish are divided into male and female from the aspects of abdominal foot, reproductive orifice and claw foot. The specific photos are as follows:

1. Abdominal feet

From the abdominal feet of crayfish, the male and female are distinguished, and the first and second abdominal feet of male shrimp will gradually become white and calcareous tubular connectors with growth; The first gastropod of female shrimp degenerates and the second gastropod is feathered. For female crayfish, the bottom of the shrimp foot is transparent, and the abdomen in the middle of the shrimp foot is flat. The male crayfish has a dark sole and a convex belly.

2. Reproductive orifice

The male and female are distinguished from the reproductive orifice of crayfish, and the reproductive orifice of male shrimp is located at the base of the fifth pair of pectoral feet; The female shrimp's reproductive hole is open at the base of the third pair of pectoral feet.

3. Clawed feet

From the clawed feet of crayfish, male and female are distinguished, and adult shrimps with similar body length have thick clawed feet, and the spinous processes on wrist and palm joints are long and obvious; Female shrimp has relatively small claw feet.

living habits of crayfish

crayfish has a wide adaptability and a wide suitable growth temperature, and can grow and develop normally when the water temperature is 1-3℃. It can also resist high temperature and cold, can tolerate high temperature above 4℃, and can also survive the winter safely when the temperature is below -14℃. The crayfish grows rapidly. After more than two months' cultivation, it can reach sexual maturity and meet the specifications of commercial shrimp. Generally, male shrimp grows faster than female shrimp, and the specifications of commercial shrimp are also larger than female shrimp.

Like many crustaceans, the growth of crayfish is accompanied by molting. When molting, they usually look for hidden objects, such as water grass or under plant leaves. After molting, the maximum weight gain can reach 95%. Generally, sexual maturity can be achieved after molting for 11 times, and sexual mature individuals can continue to molt and grow. Its life span is not long, about one year. But in the case of food shortage, low temperature and drought, the life span can reach 2-3 years at most.