看鱼眼。没受到污染的鱼,鱼眼微突,富有色泽。受到污染的鱼则眼球浑浊,有的眼球有明显突出。看鱼鳃。没受到污染的鱼,鱼鳃鲜红,排列整齐。受污染的鱼,鳃呈白色,且非常粗糙。看鱼尾。没受到污染的鱼,鱼尾正常。受到污染的鱼,其尾鳍变弯曲僵硬,或畸形。闻气味。没有受到污染的鱼,有一股新鲜湿润的腥昧。受到污染的鱼则有一种汽油或类似氨的气味。 Look at the fish eye. Fish that are not contaminated have fisheyes and are rich in color. Polluted fish are turbid eye, and some prominent eyeballs. Look at fish gills. Not contaminated fish, bright red fish gills, arranged in neat rows. Polluted fish, white gills, and very rough. Look at the fish tail. Uncontaminated fish, tail normal. Contaminated fish, the caudal fin becomes stiff, or deformed. Smell the smell. Fish that are not contaminated have a fresh, wet smell. Polluted fish have a petrol or ammonia-like odor.