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冬季因气温低,越冬鱼种易受冻害,成活率比较低。近年来,辽宁辽中县采用生态调节法提高鱼池温度,既增强了鱼类在冬季的摄食能力,保持膘度,又减少了冻害,提高了池鱼越冬成活率。经测定:此法可比其他鱼池的水温提高2℃左右(阴雨雪天除外),无风的晴天随气温升高水温可上升3℃以上,鱼种越冬成活率由70%左右提高到90%左右。具体方法是:1.结合鱼种并塘。选择背风向阳、面积2000～3500平方米、长
Winter due to low temperatures, wintering fish vulnerable to cold damage, survival rate is relatively low. In recent years, Liaozhong County, Liaoning Province, using ecological regulation method to raise the temperature of fish ponds, not only enhance the ability of fish to feed in the winter, maintain the degree, but also reduce the frost damage and improve the survival rate of the fish overwintering. It is determined that the water temperature of this method can be increased by about 2 ℃ than that of other fish ponds (except for rainy and snowy days), and the sunny days with no wind can rise by more than 3 ℃ and the survival rate of fish overwintering from about 70% to about 90% . The specific method is: 1. Combination of fish species and ponds. Choose lee sunny, with an area of 2000 to 3500 square meters, long