Tianjin fish farms found to use banned carcinogen

Some unlicensed fish farmers in the Tianjin Binhai New Area have been using a banned substance to raise fish, Beijing News reported.

The fish farmers reached by the newspaper were using various antibiotics and organic chemicals, including malachite green, an industry dye that can cure several fish diseases, but is a potential carcinogen for people.

Once widely used nationwide, the substance was banned in aquaculture in 2002.