What should I do if a large number of crayfish molt and a soft shell steals to death?

Crayfish growth rate is fast, in the case of suitable water temperature and adequate feed, juvenile shrimp are generally cultured for 2 3 months to reach the commercial specifications, crayfish is accompanied by another molt gradually grown, each molt shell, the size is larger, its feed intake has also increased, juvenile shrimp growth stage every 5 8 days molt a shell, late growth generally 8 20 days molt a shell, crayfish molt 11 times can reach sexual maturity, sexually mature crayfish can continue to molt and grow. By strengthening feeding management, the protein level in the feed is increased to promote the natural molting and growth of crayfish. Artificial control to promote crayfish molting as soon as possible, first of all, we should ensure that the pond aquatic weeds account for more than 30% of the total area of the pond, maintain the excellent water quality of the pond, and increase the content of animal feed in the self-formulated feed, such as snails, mussel meat, animal scraps, etc., to improve the quality of feed, and promote the molting of crayfish and the hardening of shrimp shells after molting.

The whole pond is sprinkled with quicklime slurry, on the one hand, it disinfects the water body, improves the pH of the pond water body (the acidic water body is not suitable for the normal growth of crayfish during the molting period), and on the other hand, increases the calcium source in the water body to provide calcium for the crayfish after molting. In addition, under the condition of ensuring feed nutrition and breeding environment, ecidin can be added to the feed of crayfish to improve the synchronization of group molting and improve the size and yield of crayfish. If a micro-flow state is provided at this time (or if the water is changed frequently), keeping enough dissolved oxygen in the pond can speed up the molting of crayfish.

This phenomenon is the crayfish carapace abnormality, mainly due to the lack of vitamins, trace elements, mineral elements, it is recommended that you use Zhengchang crayfish premix, a comprehensive supplement of crayfish needs a variety of trace elements and mineral elements.

There may be gray-white spots, or he has a lot of space now when it is serious, it will lead to the loss of lobster shells, so you must be careful when breeding, if the shrimp seedlings are injured, they must be eliminated, do not continue to put them in the breeding, and the pond must be disinfected before breeding, which can be disinfected with salt water, or with keto-iodine. Of course, you can also change the water in the pond frequently.

There will be grayish spots on the surface of the lobster shell, and sometimes the shell will turn black, there will be severe ulceration, and there will be many hollows on the crayfish's body. At this time, it is necessary to use natural antibacterial powder, which can also disinfect the shrimp seedlings and ensure the cleanliness of the water quality.

The surface of the shell will be ulcerated, and sometimes some spots will appear, and the crayfish will die easily. It can be carried out with chemicals**, and at the same time, the water quality must be guaranteed, and regular sterilization and disinfection should be carried out. Be sure to change the water regularly.

1. Reason: During the growth process of crayfish, the body will continue to grow, and the carapace cannot automatically become larger with the growth of the body, so as to meet the body needs of the lobster, so it needs to constantly molt and grow a larger new carapace, so as to ensure that it can grow normally. 2. Number of molts:

The lobsters undergo about 10 molts in the first year and annually until they reach maturity, after which they may change their shells every 3 years.

1. What's going on with crayfish shelling

1. Crayfish is a crustacean that grows mainly through molting. Because during the growth process, the body of the lobster will continue to grow, and the carapace cannot automatically grow larger with the body, so it cannot meet the body needs of the lobster, so it needs to constantly molt and grow a larger new carapace, so that it can grow normally.

2. In the first year, the lobster generally needs to go through about 10 molts, and then it needs to go through molting once a year until the lobster matures. Lobsters that mature may change their shells every 3 years or so.

3. The new body of the lobster after molting begins to harden after about 12-24 hours.

4. The molting cycle of lobster can be divided into molting interphase, premolting period, molting period and late molting period. During the molting period, the crayfish feed vigorously, and the carapace gradually hardens. In the early stage of molting, the crayfish stops feeding, and the calcium in the carapace is transferred to the calcium stone in the body, the calcium stone becomes larger, the carapace becomes thinner and softer, and gradually separates from the endocortical layer.

During the molting period, the little dragon lies on its side and begins to molt, which lasts from a few minutes to more than ten minutes. In the later stage of molting, water enters the lobster from the cortical layer, the body gains weight and increases, and the calcium of calcium stone in the body is transferred to the cortical layer, and the cortical layer becomes hard and thick, turning into a carapace, and the calcium stone gradually becomes smaller.

Second, the solution to the shelling and death of crayfish

1. Before molting, strengthen feed management and feed more nutritious feed to meet the nutritional needs of crayfish.

2. Crayfish has a certain ability to tolerate hypoxia, and generally requires the dissolved oxygen content of the water body to be more than 3mg L, but during the molting period, the crayfish has higher requirements for the dissolved oxygen content of the water body, and generally needs to ensure that it is above 5mg L.

3. During the molting period, lime is used regularly to supplement the calcium element of the water body to ensure that the lobster can molt smoothly. Under normal circumstances, 5kg of lime is used per mu of pond for every 1m of water depth, and it is used every 10 days.

4. During the molting period, keep the lobster quiet to avoid the crayfish being disturbed by the external environment and not being able to molt smoothly, which will lead to the death of the crayfish.

5. Change the bottom every 10 days, and change the water frequently to adjust the water quality.

The dark green carapace of the crayfish is moss-attached or ciliate parasitic can be judged by the following methods, catch a crayfish with a dark green carapace, if the dark green material can be peeled off by hand, it is mostly moss-attached, if the crayfish's carapace is more slippery to the touch, the dark green material is not easy to be peeled off or peeled off, and it is mostly ciliate parasitism.

The crayfish carapace is dark green, if the moss is attached, first apply inorganic fertilizer to the water body to improve the transparency of the water body, in addition, the whole pond can also be sprinkled with quicklime to improve the pond water quality and improve the calcium content in the water body, and improve the calcium content in the feed, promote the crayfish molting, 3 5 days later, and then change the water in the whole pond to improve the water quality of the pond.

If the crayfish carapace caused by ciliate parasitism is dark green, generally when using zinc sulfate to kill ciliates, ferrous sulfate solution can be used, if the effect of killing ciliates is not good, a small amount of copper sulfate solution can be used (the dosage should not be too large), the effect is better. In addition, the whole pool is regularly sprinkled with quicklime solution to disinfect and improve water quality, which can also increase the calcium content in the feed to promote crayfish molting, and the water should be changed regularly to maintain a good water quality environment.