我国北方地区,冬季有长达近4个月的冰封期,因而隔年的大规格鱼种或还达不到上市规格的鱼,都要经过越冬期,所以鱼类的越冬管理,也是池塘养鱼的重要环节之一。 在严寒的冬季,如果管理不善,就会大量死鱼。鱼类死亡的原因主要有二:一是水中氧气不足。当水面封冻后,池水与外界空 In the northern part of our country, winter has a freezing period of nearly 4 months. Therefore, large-sized species of fish of the next year or fish that still fail to meet the market specifications will have to pass the winter period, so the wintering management of fish is also a matter of pond culture One of the important aspects of fish. In cold winter, if poorly managed, there will be a lot of dead fish. There are two main reasons for the death of fish: First, there is not enough oxygen in the water. When the water surface frozen, the pool water and the outside world