1, see the fish eye. The fish that have not been contaminated have fish eyes that are slightly protuberant and full of color. Contaminated fish had cloudy eyes and some eyes were prominent. 2, see the fish. The fish that have not been contaminated are bright red and well-arranged. The contaminated fish is white and its shape is very rough. 3, see the fish tail. Fish that is not contaminated have normal fish tails. Contaminated fish, its tail spine is stiff and deformed. 4, smell the smell. Unpolluted fish have a fresh, moist odor. Contaminated fish has a smell of gasoline or ammonia.
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