The male's pincers are more developed than the female's, and there is a bright red band at the lateral end of the male, which is the secondary sexual characteristic of the male and the female respectively. There are three pairs of tentacles, and the lateral 1 pair is particularly thick and long, which is about 1/3 longer than the body; There are five powerful tail fans at the tail, three on the outside and 1 smaller in the middle.

During spawning and hatching, the tail fan often bends inward to wrap the eggs attached to the abdomen, so as to protect fertilized eggs and young shrimps from being damaged when the mother shrimp crawls or is attacked, which is also the difference between shrimp with eggs and shrimp without eggs. The male genitalia is born at the base of the fifth pair of feet, with 1 on the left and right, showing blue transparent protrusions. Female genitalia is located at the base of the third pair of chest feet, which is round and has a membrane cover.

Extended data

Red crayfish, known as Australian freshwater crayfish in China, is a benthic reptile. It likes fresh water and running water, likes to live in groups, likes to go out at night, and mostly feeds in the evening and before dawn. But when feeding during the day, it also eats feed, often living in a relatively hidden place in the water, with the characteristics of countercurrent movement.

The shrimp has a wide range of temperature adaptability, the survival temperature is 3℃-37℃, and the optimum growth temperature is 65438 08℃-32℃. It is resistant to hypoxia and can grow in various inferior water bodies. Red crayfish don't like killing each other, but they can tolerate high-density environment. At present, there is no official authoritative research report on cannibalism, but aquaculture practice shows that when shrimps are seriously deprived of oxygen, they will fight with each other, and when feed sources are extremely scarce, they will devour each other.

During the whole growth process of red crayfish, peeling will occur many times, mostly at night and in shallow water, and the process takes 10-30 minutes. The peeled shrimp body is wider than the original body 15%-35%. With the growth of shrimp, the time span of peeling is longer.

Shrimp is a broad-spectrum omnivore, which feeds on animal foods (fish and snail meat, etc.). ) is the staple food, supplemented by plant food (roots and leaves of green aquatic plants). In artificial feeding, all commercial compound feeds can grow well.

Baidu encyclopedia-Australian freshwater crayfish

Baidu encyclopedia-Australian lobster