一、看鱼形:污染较重的鱼,其鱼形不整齐头大尾小,脊椎、尾鳍弯曲僵硬或头特大而身瘦、尾长又尖。这种鱼含有铬、铅等有毒有害重金属。二、观全身:鱼鳞部分脱落,鱼皮发黄尾部灰青,有的肌肉呈绿色,有的鱼肚膨胀。这是铬污染或鱼塘大量使用碳酸铵化肥所致。 First, look at the fish-shaped: heavier pollution of fish, its fish-shaped head is not tidy big tail, vertebrae, caudal flexure stiff or head large and thin, tail length and pointed. This fish contains chromium, lead and other toxic and harmful heavy metals. Second, the concept of the whole body: part of the shedding of fish scales, tail yellowish yellow skin, and some muscles were green, and some maw swelling. This is caused by chromium contamination or extensive use of ammonium carbonate fertilizers in fish ponds.