稻田水浅、水温高、溶氧充足、饵料生物丰富,培育出的一龄鱼种体质健壮,肥满度较好。但由于长江以北地区是单季稻,相比之下也比较冷,鱼一般不能在田间过冬,需采取池塘越冬的方法来提高稻田一龄鱼种的越冬成活率。 1.选择好的越冬水体 越冬水体多为静水体,远离污染源,水深保持在1.5～3米,无大量水草,池底平坦,淤泥较少。因为大量水草冬季枯死,极易败坏水质;底泥中的有机物分解要消耗大量溶解氧,产生二氧化碳或硫化氢气体,促使pH值下降,导 Paddy shallow water, high water temperature, adequate dissolved oxygen, abundant food organisms, breeds of a-year-old breeding fish robust physique, better fatness. However, since the area north of the Yangtze River is a single crop of rice, which is comparatively colder, the fish generally can not win the winter in the field. The method of pond overwintering needs to be adopted to improve the survival rate of overwintering fish species of the first age. 1. Choose a good wintering water body The overwintering water body is mostly still water, far away from the pollution source. The water depth is kept at 1.5-3 m. There is no large amount of aquatic plants, the bottom of the pond is flat and the sludge is less. Because a large number of dead plants in winter, easily corrupted water quality; sediment decomposition of organic matter to consume large amounts of dissolved oxygen, produce carbon dioxide or hydrogen sulfide gas to promote the decline in pH, lead