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(一)放养密度过大或施肥、投饵过多引起缺氧 预防鱼泛塘,应当采取合理的放养密度及施肥、投饵量。要想提高放养密度,则应采用增氧机,应急时使用增氧剂。 鱼泛塘时一般都有征兆出现,要细心观察。浮头前最容易看到的征兆是鱼无病而食量锐减,遇到这种情况要立即冲水急救,开放
(A) the stocking density is too large or fertilization, excessive feeding caused by hypoxia prevent fish Pan Tong, should adopt a reasonable stocking density and fertilization, feeding amount. In order to increase the stocking density, aerators should be used and oxygenates should be used in case of emergency. Pan-Tong fish usually have signs appear carefully observed. Floating head is the most easy to see signs of fish disease-free and food intake dropped, in such cases should immediately flush first aid, open