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一、鱼类发生疾病原因一般来说，鱼患病后活动失常，减少或停止摄食，轻则影响生长，重则造成大批死亡，致使鱼类发生疾病的原因有以下几个方面：（一）环境因素１．自然因素（１）水温：鱼类生活在水中，在其不同的生长发育阶段，对水温都有一定的要求，水温突然大幅度变化，
First, the causes of diseases of fish In general, the fish sick after the disorder, reduce or stop feeding, ranging from the impact of growth, while causing a large number of deaths, resulting in fish diseases due to the following aspects: (a) Environmental factors Natural Factors (1) Water temperature: fish living in water, in its different stages of growth and development, have certain requirements on the water temperature, water temperature suddenly changed dramatically,