一、清塘消毒清塘最好在冬季进行,方法是先排干池水,挖去过多的淤泥,修补漏洞,消除杂草,让池底经冰冻日晒数日后注水30厘米左右,然后用药物消毒,以杀灭细菌、寄生虫和有害生物。每亩水面用生石灰75～100公斤,或五氯酸钠2～3公斤全池泼洒。二、选择优良苗种选择优质苗种是预防蟹 First, the Qing Tong disinfection Qing Tong is best carried out in winter, the method is to drain the water first, dredging too much mud, loopholes to repair and eliminate weeds, so that the pool by the sun after a few days after the injection of water 30 cm or so, and then use Drug disinfection to kill bacteria, parasites and pests. Kilo per acre with lime 75 to 100 kg, or 2 to 3 kg of sodium chlorate Quanchiposa. Second, choose good seed selection High-quality seed is to prevent crab