Crayfish is short of calcium. Look at the growth of aquatic plants in the shrimp field and you can conclude that water and fertilizer are not fat, because without good aquatic plants, you can't raise good shrimp. Lobsters don't have a high demand for oxygen, but we should also be careful not to let the water be short of oxygen for a long time. Lack of oxygen will lead to lobster not molting, and may lead to lobster's unsuccessful molting and death during molting. This problem is also a common problem for our lobster farmers. In fact, crayfish don't shell or shell failure means that crayfish can't shell normally, shell can't be carried out normally, and its growth will stop and die slowly.
The content of natural calcium in aquaculture water is gradually exhausted with the increase of culture density and crayfish individuals. However, both aquaculture water and crayfish need a lot of calcium. At this time, supplementary calcium sources should be put into the water in time according to the situation to increase the calcium content of the water, which can effectively promote the reproduction and growth of algae.
Crayfish will begin to shell from the young shrimp, and will shell every once in a while, from 3-4 days in the initial young shrimp stage to about 7 days in the shrimp fry, and the adult shrimp stage will be extended to more than 20 days. As the crayfish grow up, the time interval of shelling will slowly increase. In shrimp ponds, it is best to use a mild iodine preparation such as "super iodine". This is less irritating to crayfish, so that it can spend the shelling period more smoothly.