致鱼死亡的化学物主要指重金属、农药、无机物、有机物(如黄磷、氨、酚、石油类、酸、碱等)和混合废水等。某些化学物中毒致死单从物理现象上即可确诊,如石油污染中毒,水域表面可见大量油膜,鱼肉有煤油及酚味;有机磷农药中毒,可嗅到水体和鱼肉有特殊的农药气味等,但绝大多数化 Chemical substances that cause death of fish mainly refer to heavy metals, pesticides, inorganic substances, organic compounds (such as phosphorus, ammonia, phenol, petroleum, acid, alkali, etc.) and mixed wastewater. Some chemical poisoning is lethal from the physical phenomenon can be diagnosed, such as oil pollution, the surface of the water can be seen a lot of film, fish kerosene and phenol smell; organophosphate pesticide poisoning, can smell water and fish have a special pesticide odor , But most of them