冬季,天寒水冷,鱼种新陈代谢降低了,活动量减少了,停止摄食和生长,靠体内积蓄的脂肪维持生命,进入冬眠状态。近年来一些养鱼户越冬鱼种的成活率普遍降低,只有30～50%。要提高鱼种越冬成活率,必须把好如下四关。1.把好水深关越冬塘水要保持在2米以上,最少不得低于1.5 In winter, the water is cold and cold, the metabolism of fish is reduced, the activity is reduced, the feeding and growth are stopped, and the fat accumulated in the body sustains life and enters the hibernation state. In recent years, some fish farmers overwintering species of fish survival rates generally lower, only 30 to 50%. To improve the survival rate of fish overwintering, we must make the following four levels. 1. The good water depth of the winter pond water should be maintained at 2 meters or more, at least not less than 1.5