1, feed delivery
Generally, the feeding amount of feed is 6% of the weight of shrimp in pond. During the growth of crayfish, it is necessary to shell 1 1 times, so there are certain requirements for calcium intake. You can grind mussel shells into powder, mix them into feed and put them together. Crayfish is an omnivore, and grass accounts for 80% of crayfish's food. Therefore, there must be enough water plants in the pond, which can purify the water and is also the main source of crayfish's food.
2. Water quality management
The water level management should be based on the principle of "shallow-deep-shallow-deep" according to the seasonal and temperature changes, that is, the principle of "shallow in spring and full in summer" should be mastered, and the water should be changed and replenished in time. If conditions permit, machines can be added to promote the flow of the upper and lower water layers, and the oxygen content of the water body can be improved by making full use of the oxygen production of aquatic plants.
3, disease prevention management
Crayfish have few diseases, so they generally don't get sick. If they get sick, they should suit the remedy to the case, use chlorine dioxide for disinfection and sterilization, use zinc sulfate for ciliates, and prohibit polyester and organophosphorus drugs. Common diseases of crayfish include gill rot, black gill rot, tail rot, and condensed worm disease. The application of quicklime once a month, with the dosage of 20kg per mu, can not only improve the water quality, but also increase the calcium in the water and promote the lobster shelling.
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 10-30℃. It can also resist high temperature and cold, can tolerate high temperature above 40℃, 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 1 1 time, and sexual mature individuals can continue to molt. Its life is not long, about 1 year. But in the case of food shortage, low temperature and drought, the life span can reach 2-3 years at most.