慢性气泡病发生机理及其衍生后遗症的危害

水温形成的养殖水体上下分层非常普遍且明显。晴天上表水层藻类光合作用产生的氧气,与池底有机物处于缺氧还原环境下脱氮产生的氮气,在上下水层不能进行交流的情况下,经常处于过饱和的现象。生存在这样水体的鱼类,不论是在鱼苗阶段还是成鱼阶段,过饱和游离气体将不可避免地进入其体内,使其患上气泡病。相对于鱼苗气泡病的急性发病症状,患上气泡病的成鱼不会有明显症状,称作慢性气泡病。目前由于人们对慢性气泡病产生机理了解不多或存在认识误区,致使气泡病常常成为继发病原性疾病的诱因,也是滥用药的入口。因此,我们应充分认识慢性气泡病发生机理,采取科学有效措施,消除气体过饱和的现象。

The mechanism of chronic gas bubble disease and the harm of its derived sequelae

The stratification of aquaculture water caused by water temperature is very common and obvious.Without mixing of upper and lower water,the oxygen produced by the photosynthesis of the algae in the surface water on sunny days and the nitrogen produced by the denitrification of the organic matter at the bottom of the ponds in the anoxic environment is often supersaturated.The supersaturated free gas will inevitably enter fish bodies who will suffer from air bubble disease,regardless of fry or adult.Compared with the acute symptoms of the air bubble disease in the fry,the adult fish suffering from air bubble disease will not have obvious symptoms.Thus it is called chronic air bubble disease.To date,there is a lack of knowledge or even misunderstanding about the mechanism of chronic bubble disease.Without intervention,the air bubble disease often becomes the cause of secondary pathogenic infections,and also leads to drug abuse.Therefore we should fully understand the mechanism of chronic air bubble disease,take scientific and practical measures to eliminate the phenomenon of gas oversaturation.