养鱼生产危害最大,损失严重的是“泛塘”。一般2—3小时之内,就会造成全塘鱼的死亡。近年来,我省南部地区五月份曾多次发生“泛塘”。其原因是:放养密度大,投饵、施肥集中或过量,使水质污染,另外,气温高和气候恶劣,使鱼塘水中严重缺氧,而造成“泛塘”。“泛塘”的征兆及予防: Fish production most harmful, the serious loss is “Pan Tong.” Generally 2-3 hours, it will cause the death of the whole pond fish. In recent years, the southern part of our province had “Pan Tong” many times in May. The reason is: stocking density, feeding, concentration or excessive fertilization, so that water pollution, in addition, the high temperature and poor climate, so that a serious hypoxia in the pond water, resulting in “Pan Tong.” “Pan Tong” signs and to prevent: