Why does the crayfish molt? What should farmers pay attention to during the molting period?

The growth of crayfish is mainly accomplished by molting. Crayfish need to molt 11-12 times from larval stage to commercial shrimp, and each molting is equivalent to a "new life". Molting is an important symbol of crayfish growth and development, weight gain and reproduction. The quality of molting directly determines the size of crayfish, so how to improve the success rate of molting is very important! As a reminder, the reason for lobster molting is almost similar to the principle of women giving birth, so it may feel easier to understand!

Friends, sit tight and listen to the old driver share!

First, why does crayfish molt?

Lobster is a kind of crustacean, which grows by molting, and molting occurs many times in the whole growth process from juvenile to adult.

In the process of breeding, we often encounter the problem of crayfish soft shell, death caused by attempted molting, and being eaten by the same kind during shelling. In order to allow the crayfish to shell smoothly, preparations should be made before the crayfish is shelled.

Second, what are the corresponding preparatory work?

Adjust the quality of water, pay more attention to culture; add calcium to ensure dissolved oxygen

1. Improve the water quality

Regular use of microbial preparations is low, the common microbial preparations are Bacillus subtilis, EM bacteria, light and bacteria, nitrifying bacteria, denitrifying bacteria; Bacillus subtilis and EM bacteria are the most commonly used in freshwater culture; seawater and brackish water culture are commonly used. It is used once a week in the culture cycle, and two or more strains are used in turn, so that the water environment is optimized and shelling is guaranteed.

2. Pay attention to nutrition

Feeding comprehensive nutritious feed, the crayfish molting process needs to consume a lot of energy, and the energy mainly comes from our daily feed. Before molting, it is suggested to strengthen bait feeding and nutrition, and can feed more animal bait or high-protein commercial feed. Depending on the water quality, the eating situation is reasonably increased to meet the crayfish storage of nutritional energy. At the same time, for the high temperature months of the disease outbreak, allicin, Sanhuang powder, Wuhuang powder and other traditional Chinese medicine should be added to the feed to prevent enteritis, hepatopancreatic lesions and so on. In May, you can feed with mixed feed such as Radix Isatidis, ten drops of water and so on.

3. Increase calcium

Regular use of lime, supplement of calcium in the water, so that sufficient calcium in the water, conducive to the crayfish for calcium demand, to ensure safe shelling. For crayfish, it is recommended that the amount of lime should be 10 jin per mu and 1 meter deep, once every 10 days.

4. Ensure dissolved oxygen

To ensure dissolved oxygen, freshwater crayfish has a certain tolerance to hypoxia, but in pond culture mode, especially in intensive culture mode, the density is high, the demand for dissolved oxygen is high, and the general requirement should not be lower than 3mg/L. In addition, crayfish have higher requirements for dissolved oxygen during molting and must be kept above 5mg/L.

During molting, shrimp's physical strength and self-protection ability is relatively weak, sufficient dissolved oxygen can make shrimp better recovery. At the same time, the natural enemies of crayfish, such as blackfish, catfish, rice field eel, etc., should be avoided.

* third, what are the precautions during molting?

1. Lobster molting needs a quiet environment, so try to reduce work in the water during molting!

2. During the molting period, although the lobster does not eat much, it should not be fed completely, because it is very difficult for the lobster in Tangkou to molt synchronously, and insufficient bait will kill the soft-shell shrimp.

3, the resistance is weak during molting, do not use irritant drugs, such as insecticides, liverworts, etc., in order to avoid greater stress or poisoning

4. Patrol the pond frequently and pay attention to the shelling of lobster in time.

* how to tell if crayfish need calcium supplements?

To introduce a simple method, peel off the crayfish's head breastplate, facing the sun, you can obviously feel the feeling of being penetrated by the sun, thin and fragile. This situation is the need for calcium supplement!

Warm Tip: as long as the hardness of Tangkou water is enough, you can basically replenish calcium without lime or calcium supplement products!

Author: Liu Guangjin