What common diseases do farmers have when raising crayfish and their prevention methods?

Pathogen: crayfish water mold is caused by water mold. It is mainly caused by mechanical damage, disease infection, parasite invasion and water quality deterioration of crayfish. Symptoms: The initial symptoms are not obvious. When the symptoms are obvious, the hyphae have invaded the epidermal muscles, and the water is grayish white, like cotton wool. The muscle tissue of the wound is covered by hyphae of different lengths, and the tissue cells there gradually die. Sick shrimps are emaciated, weak and restless, and eat less, which can lead to death in severe cases. Precautions: Be careful when fishing, handling and hauling nets to avoid damage to shrimp. In winter, it is necessary to deepen pond water, reduce fishing operations and avoid shrimp frostbite.

Crayfish plague

Pathogen: fungi. Symptoms: There are yellow or brown spots on the body surface of the sick shrimp. Filaments of fungal cells can be found at the base of appendages and eyestalks. Pathogens invade lobsters, attack the central nervous system and quickly damage motor function. The action of sick shrimp is slow, and the activity ability is greatly weakened or abnormal, which easily leads to a large number of deaths of sick shrimp. Prevention method: Dilute with "special iodine" and sprinkle the pool water with 6-8 mu of water/bottle. Keep the water fresh, and keep the normal water color and transparency. Every 7- 10 days, use "one bag of dikang 1+ one bag of dikang 3" to increase the dissolved oxygen in the water, decompose the residual bait and organic matter, and combine 4 mu at a time at a high temperature of 3 mu.

Branchial diseases

Pathogen: filamentous bacteria. Pathogenic characteristics: The pathogen is filamentous bacteria. Bacteria multiply in shrimp gills, which hinders shrimp breathing; In severe cases, gill filaments turn black and fester, leading to shrimp death. Control method: every 7- 10 days, use "one bag of dikang 1+ one bag of dikang 2" to improve dissolved oxygen in water, decompose residual bait and organic matter, and combine four mu at a time at high temperature of three mu, which has good control effect; After diluted with "special iodine", the pool water is splashed with 6-8 mu of water/bottle; At the same time, "Kangbeining+Kangmei No.2" was taken orally, and each group was mixed with 40 kg and fed with 5? Jesus Christ.

Black gill disease (Fusarium disease)

Pathogen: A semi-unknown fungus in the genus Pathogen. The disease is caused by the deterioration and pollution of pond water quality, which promotes the proliferation of Fusarium and parasitizes crayfish gill filaments, body walls, appendages or eyeballs. Symptoms: The crayfish gills first change from red and white to brown or light brown, and then gradually turn black. Sick shrimps often lie motionless on the shore, their gills atrophy, they have difficulty breathing, and then they die slowly. Prevention and control methods: use "Dikang 1 bag+Dikang 3 bags" every 7- 10 days to improve dissolved oxygen in water and decompose residual bait and organic matter, with a combination of four acres and a high temperature of three acres; The water body is regularly sprayed with "Yangshuibao" to adjust the water quality. Spray disinfection with "combined aldehyde"