鱼类“泛塘”是指鱼类严重浮头,继而大量死亡的现象。在水产养殖中,如不及时防治或急救,常会造成很大的损失。1.气候不适引起的“泛塘”在池塘载鱼量较大的情况下,如连续阴雨,长时间晴热后突降暴雨,秋季浓雾等都会引起“泛塘”。阴雨天光照不足,水生植物光合作用能力减弱,水中耗氧而又得不到较多补充,造成水体缺氧,引发鱼类“泛塘”。长时间晴热后突降暴雨使水体表面温度剧降,而底部温度仍然较高,造成上下水层对流,使底层含氧低的水和有机质带到水面,加速有机质分解,消耗水中氧气,同时产生大量的二氧化碳、硫化氢和氨气等有害物质, Fish “Pan Tong” refers to a serious floating head of fish, followed by a large number of deaths. In aquaculture, if not timely prevention or first aid, often cause great losses. 1. Pan Tong caused by climate discomfort In the case of large carrying capacity of ponds, such as continuous overcast and rainy days, sudden heavy rain after long days of fine weather and heavy fog in fall, it will cause “pan-pond”. Rainy days lack of illumination, aquatic photosynthetic capacity weakened, oxygen in the water without more supplements, resulting in oxygen hypoxia, trigger fish “Pan Tong.” Sudden drop of heavy rain after a long time of sunny so that the surface temperature of the water drastically decreased, while the bottom temperature is still high, resulting in upper and lower aquifers convection, the bottom of the low oxygen water and organic matter to the water to accelerate the decomposition of organic matter, water consumption of oxygen, while Produce a large amount of harmful substances such as carbon dioxide, hydrogen sulfide and ammonia,