随着水产养殖技术的不断提高,北方地区淡水养鱼产量在逐年增加。鱼多了,渔民们不再限于春放秋捕,而是秋、冬、春甚至夏季,一年四季将商品鱼均衡上市,所以不但鱼种需要越冬,而且商品鱼也需要越冬。如何保证养殖鱼类安全越冬,就成为生产中一个极为引人关注的问题。 With the continuous improvement of aquaculture technology, freshwater fish production in the northern region is increasing year by year. More fish, fishermen are no longer limited to the spring and autumn, but autumn, winter, spring and even summer, a balanced list of commercial fish all year round, so not only the species need to wintering, but also the need for winter fish. How to ensure the safety of farmed fish overwintering has become an issue of great concern in production.