Chemical out-of-limit lobster poisoning prevention and treatment of freshwater lobster poisoning

Freshwater crayfish are sensitive to chemicals and can be poisoned if they exceed the limit. The substances that can cause crayfish poisoning are collectively referred to as poisons, and their units are milligrams per liter and micrograms per liter.

crawfish

1. Etiology: there are many substances that can cause freshwater lobster poisoning, which can be divided according to the source, including decomposing organic matter in the pool, industrial sewage, pesticides, chemical fertilizers and so on. Residual bait, excreta, aquatic plants and animal carcasses in the pond produce large amounts of ammonia, hydrogen sulfide and nitrite after decay and microbial decomposition; industrial sewage contains heavy metal elements such as mercury, copper, cadmium, zinc, lead, chromium, petroleum and petroleum products, and toxic chemicals, which can poison shrimp, causing slow growth and even death. In addition, lobster is particularly sensitive to many pesticides, such as trichlorfon, dipterex, malathion, parathion, etc., which can not only directly damage the body of shrimp, but also cause chronic death caused by hepatopancreatic lesions.

two。 Symptoms: one is chronic, dyspnea, reduced food intake, sporadic death, with the development of the epidemic, mortality increases, mostly caused by decomposition of a large amount of organic matter in the pond; the other is acute, mostly caused by industrial sewage and organophosphorus pesticides, there are a large number of deaths, bodies float or sink, especially when the amount of dissolved oxygen in the pool water is low in the early morning.

3. Prevention and control measures: (1) carefully check the source of shrimp pond, whether there are industrial sewage, domestic sewage, rice field sewage, biological sewage and so on; whether there are new sewage plants and farms around the shrimp pond; whether the water source has changed, etc. (2) immediately transfer the surviving crayfish to a new pool sterilized by cleaning pool and increase the amount of dissolved oxygen to reduce the loss. (3) clean up water sources and water environment, eradicate pollution sources, or select areas that meet the standards to build new ponds. (4) the newly built aquaculture pond must be soaked before use in order to reduce the content of harmful substances.