Prevention and treatment of long hair on crab face, poor appetite and slow river crab

Growing river crabs sometimes grow hair on their head, chest armour and abdominal limbs. The crab's surface is not clean, and it is slow, anorexic, malnourished, dyspnea, chelate feet do not clip people, and cannot shell and die. The main cause of this situation is the disease of river crabs. It is necessary to prevent and cure it as soon as possible. The earlier the prevention and control, the better the effect and the loss can be avoided. So which diseases of river crabs will lead to long hair and how to prevent and cure them?

river crab

One is water mildew. The hyphae of water mold, in the form of gray cotton, attach to the surface of the river crab and cause the crab to grow hair. The cause of disease: the water quality of crab pond is too fat, not fresh, less water injection, crab body damage and so on. Prevention and control method: the average depth of the pool water is 1 meter, and the whole pool is sprinkled with 333 grams of dichlorohydantoin per mu.

Second, river crab fixed ciliosis. Constrictor, cumulus and other parasites are parasitic or attached to the dorsal shell, step and Gill of river crabs, forming a fluffy shape. The cause of the disease: the water quality of the crab pond is too fat and does not change the water for a long time. Prevention and control methods: the average depth of the pool water is 1 meter, and 500 grams of insecticides such as Xian Chong Jing or Shachongjing can be used to sprinkle the whole pool of water per mu.

The third is filamentous algae disease. Filamentous algae attached to the body surface of river crab made the green filamentous villi grow on the surface of river crabs, and the villi were bent irregularly. Causes of the disease: excessive water quality, pH value less than 7.5, moss growing in the pond, etc. Prevention and control methods: the average depth of the pool water is 1 meter, sprinkle with 15-20 kg raw lime water per mu in the whole pool to increase the pH value, and sprinkle 500 grams of chelated copper into the whole pool of water, or 200 grams of moss mixed with soil in the whole pool, and then partially change the water after 8 hours.