Cause: Caused by parasitization of crab slaves.
Illness: Crab slaves often invade the abdomen of crabs. Crab slaves can extend into the host's body and spread to the muscles, nerves, and reproductive organs of the trunk and appendages. The crabs grow slowly, the gonads are destroyed to varying degrees, and the meat is destroyed and inedible. The disease is prevalent in the coastal areas. When the salinity in the pond is high (0.1%), the crab population can multiply, and the epidemic changes with the season. The incidence rate in July rose gradually and peaked in September.
Prevention:
1) At the time of onset, use QuanZhong 2 Quanchiposa;
2) Immerse the diseased crab with 8ppm copper sulfate solution for 10-15 minutes;
3) Place crab crabs of parasitic crabs into freshwater ponds.