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鱼种在越冬期间,特别是一些小型鱼池里,越冬鱼种一般死亡率高达10％—20％。这样不仅减少鱼种数量,还要影响来年成鱼的养殖,对渔业生产的损失较大。现将鱼种在越冬期死亡的原因与补救措施介绍如下。 一、鱼种越冬期死亡原因 1.鱼种小、体质差:在越冬时期,大多数鱼类一般都不怎么摄食,活动量也少,新陈代谢缓慢。其主要以积存在鱼体内的脂肪、蛋白质等营养来维持生命。特别是规格太小的鱼种,体质差,体内积存的脂肪等营养物质少,难以在漫长越冬期蓄积维持生存所需的能量,常因身体衰弱而死亡。其体质差,在拉网并池过程中因受伤而感染水霉等疾病引起死亡。
During the wintering period, especially in small fish ponds, the prevalence of overwintering species is as high as 10% -20%. This will not only reduce the number of fish species, but also affect the fish farming in the coming year, resulting in greater losses to fishery production. The reasons for the death of fish in wintering and remedial measures are as follows. First, the reasons for the death of fish overwintering 1. Small species, poor physical fitness: in the winter, most of the fish are generally not how to eat, the amount of activity is less, the metabolism is slow. Its main survival in the fish body fat, protein and other nutrients to sustain life. Species are too small, such as fish species, poor health, less fat and other nutrients accumulated in the body, it is difficult to accumulate in the long winter win the energy needed to survive, often because of weakness and death. Poor physical fitness, in the process of pulling the net and the pool due to injury and other diseases caused by water-borne death.