一、鱼类越冬死亡的原因1.鱼类体质与规格规格大的鱼种体质好,越冬成活率高而又健康。据多年的养殖经验看50～150克鱼种越冬成活率较高,一般体重如5～10克的鱼种,成活率为48%,20～30克的82%,30～50克的86.5%,50克以上的94.2%。规格小的鱼种含脂肪和蛋白质均低,不足越冬期的消耗 First, the reasons for the death of fish overwintering 1. Fish physique specifications and specifications of species of good fish, wintering survival rate and health. According to years of aquaculture experience 50 to 150 grams of fish overwintering survival rate is higher, the general weight of 5 to 10 grams of fish species, the survival rate was 48%, 20 ~ 30 grams of 82%, 30 ~ 50 grams of 86.5% , 94.2% over 50 grams. Species of small fish containing fat and protein are low, less than the consumption of winter