河鱼、海鱼的腹内都有一层墨膜，紧贴于腹腔内壁上。黑膜具有保护腹腔内壁不受内膜器官的磨损，并防止内脏器官内的有害物质通过肠壁渗透到肌肉中，故黑膜成了各种有害物质集聚的地方，大量集聚着细菌、脏物、农药等有毒成份。鱼寿命越长，有毒物质的含量越高，土腥味越浓。人 River fish, fish have a layer of ink inside the abdomen, close to the abdominal wall. Black film has the protection of the abdominal wall of the intima of the organ from wear and tear, and to prevent the internal organs of harmful substances through the intestinal wall infiltrated into the muscle, so the black film has become a gathering place for a variety of harmful substances, a large number of bacteria, dirt , Pesticides and other toxic ingredients. The longer the fish life, the higher the content of toxic substances, the stronger the smell of soil. people