Recently, many crab farmers wanted to learn about the prevention and control of deadly limbs in river crabs through this newspaper. According to Yang Xia, a fishery engineer from Ninghe County, crab rotten limbs usually occur from May to August every year. The main symptoms are the decay of the intestines and appendages. At the same time, the food intake of diseased crabs also begins to decline, and they even refuse to eat. Shell died. The specific prevention and control methods are as follows: First, regular use of quicklime 15 mg / l water or bleaching powder 1 to 1.5 mg / l of water, Quanchiposa; the second is to use 0.5 to 1 mg / liter of oxytetracycline for the whole pool Spilled; third is the use of chlorhydrin or chlorine dioxide Quanchiposa disinfectant, used in conjunction for 2 days; Fourth, according to 1,000 kg of feed fed with a ratio of 0.5 kg of florfenicol 0.5 kg, and even fed 3 days.
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