北方地区由于气候条件所致，冬季冰封期长，结冰期可达 150～ 180 d，冰层厚度可达 1～ 2 m，从而给鱼类的越冬造成了很大影响。因此，怎样使鱼类安全越冬，提高越冬鱼类成活率，是北方地区养鱼生产者不可忽视的一个重要问题。笔者在此介绍北方地区越冬鱼类死亡的原因及对策如 Due to the climatic conditions in the north, the winter ice period is long, the ice period can reach 150-180 days, and the ice layer thickness can reach 1 ~ 2 m, which greatly affects the overwintering of fish. Therefore, how to make the fish live wintering and improve the survival rate of wintering fish is an important issue that can not be neglected by the fish farmers in the north. Here I introduce the reasons for the death of northern winter fish and countermeasures such as