越冬鱼池的缺氧,是造成越冬鱼类死亡的主要原因之一。所以各地应对越冬期的水层管理、水质调节、扫雪保冰等工作作为避免鱼池缺氧的主要措施来抓,但尽管这样,许多地方仍有大批鱼类因缺氧死亡,特别是化冰前的一段时间尤为突出。这时期缺氧的原因有以下几点: 二、鱼池中耗氧因子迅速增加 化冰前期这段时间,一般在3月下旬到4月中旬。这时由于北方的气温逐渐回升,鱼池水中大量的有机质和微生物开始复活衍繁。水中鱼类也 The lack of oxygen in wintering fish ponds is one of the major causes of the death of overwintering fish. Therefore, water management, water quality regulation, snow protection and ice protection in winter should be taken as the main measures to avoid the lack of oxygen in fish ponds. However, in many places there are still a large number of fish died due to lack of oxygen, especially ice Former period of time is particularly prominent. The reasons for hypoxia during this period are the following: Second, the ozone depleting factor in fish ponds increased rapidly during the pre-ice period, generally from late March to mid-April. At this time due to the gradual rise in temperature in the north, a large number of fish pond water organic matter and micro-organisms began to resurrect. Fish in the water too