When do crayfish spawn? How many times a year can you lay eggs? How many eggs are laid?

Crayfish is a kind of freshwater economic shrimp, which is very popular because of its delicious meat. It is an indispensable delicacy at midnight snack stalls in summer. So do you know when crayfish spawn? How many times a year can you lay eggs? How much eggs are laid? According to crayfish farmer Uncle Li, crayfish mature at the age of 9-12 months, the mating season is usually from late April to July, and the peak of group mating is in May. When mating, the female shrimp lies on the water on its back, the male shrimp clamps the female's forefoot with the dragon foot, and the mating device is inserted into the female body. The mating time is 10-30 minutes. 3-10 hours after mating, the female shrimp begins to lay eggs, laying eggs at once, and the eggs are attached to the bristles of the abdominal feet.

How many times a year can crayfish lay eggs?

Crayfish spawn many times a year. When the water temperature rises above 20 ℃, the parent shrimp begins to spawn. The spawning season lasts for 6 months and can lay eggs 3-4 times a year.

How many eggs do crayfish lay?

The fecundity of female crayfish increases with the increase of individual length. The average egg number of female shrimp with a total length of 10.0 to 11.9 cm is 237 eggs. The largest spawning individual was 14.26 cm in total length, laid 397 eggs, and the smallest spawning individual was 6.4 cm in total length and laid 32 eggs. Under the condition of artificial word culture, the number of eggs laid by female shrimp is generally higher than that collected from natural waters.

Nutritional value of crayfish

1. Crayfish are high in protein, soft and digestible, making it an excellent food for people who are weak and in need of recuperation after illness.

two。 Shrimp meat is also rich in magnesium, zinc, iodine, selenium and so on. Magnesium plays an important role in regulating heart activity and can protect the cardiovascular system. It can reduce the content of cholesterol in the blood, prevent arteriosclerosis, and dilate the coronary artery at the same time. It helps to prevent hypertension and myocardial infarction.

3. Crayfish contain astaxanthin, which is a powerful antioxidant. Scientists at Osaka University in Japan have found that astaxanthin can help eliminate jet lag. In addition, crayfish can also be used as medicine, which can resolve phlegm and relieve cough and promote myogenic healing of the wound after operation.