我区鱼类越冬成活率仅50％左右,有些池塘甚至发生全池鱼类死光现象,其他北方地区也有类似现象,所以,在我区和其他北方地区鱼类越冬是群众养鱼的一个主要问题。造成鱼类越冬成活率不高的原因是多方面的,比如越冬池较浅,结冰后水位太低;越冬前停食早,鱼的体质瘦弱,抵抗力差;入池时 Survival rates of overwintering fish in our district are only about 50%. Some ponds even have the phenomenon of dead fish in whole pond fish. Other northern areas also have similar phenomena. Therefore, the overwintering of fish in our district and other northern areas is a major part of the fish culture of the masses problem. The causes of overwintering fish survival rate is not high because there are many reasons, such as the overwintering pool is shallow, the water level is too low after freezing; early winter before eating, thin fish body, poor resistance; into the pool