Control methods of Gill rot disease of crayfish

Gill rot disease of crayfish is a common disease with rapid transmission and long course of disease, and it is difficult to control its spread once it occurs. There are mainly two kinds of parasitic Gill rot disease and bacterial Gill rot disease. In the early stage, the prevention is better, and there is no shrimp disease. In the later stage, due to the neglect of prevention, shrimp gets sick, resulting in unnecessary losses. Therefore, prevention should be given priority to in the process of culture. Prevention is more important than cure.

Symptoms of Gill rot of crayfish

Lobster body color is black, especially the head, slow response, difficulty breathing, loss of appetite. The Gill filament of the diseased shrimp is eroded, the breathing is blocked, and it often swims to the shallow water and is motionless, which is often complicated with liver disease, enteritis, etc., with an incidence of about 50% and a mortality rate of 30%.

Treatment of Gill rot of crayfish

0.51 kg of Gill disease was added every 100 kg feed for 3 days. For external use, refined iodine (0.5 mg / L) and dibromohydantoin (0.2 mg / L) were used once a week.

Prevention of rotten Gill disease of crayfish

1. The feces of herbivores are the fruits of myxobacteria, so fermented manure must be used in shrimp ponds.

2. Taking advantage of the weakness that myxobacteria can not survive in 0.7% salt water, when the fish species are separated from the pond, the fish can be soaked in 2-2.5% salt water solution for 10-20 minutes, which can better prevent the disease.

3. the average water depth per mu of water is sprinkled with dibromohydantoin or chlorine dioxide 200 grams of chemical water in the whole pond, and the fish and shrimp bacteria must be cleaned in the whole pond, with an average of 200 grams per mu of water depth. Once a day for 2 days.