进入１１月后,气温逐渐降低,鱼类停止摄食,越冬期开始。鱼类越冬期间,由于不摄食或在越冬前营养不良,体质极弱,容易在外界环境（温度、水质、氧气、底质等）突然变化和疾病的侵袭下大批死亡,造成较大的损失。鱼类越冬最常见的问题是越冬死亡。通过分析越冬死亡的原因,可以将越 Into November, the temperature gradually decreased, fish stop feeding, overwintering began. During the wintering period of fish, due to lack of feeding or malnutrition before winter, the body constitution is very weak and it is easy to cause large losses due to the sudden changes in disease environment and the sudden changes in the external environment (temperature, water quality, oxygen, sediment, etc.). The most common problem with overwintering fish is overwintering. By analyzing the reasons for the death of overwintering, you can be more