High levels of carcinogenic agents have been detected in turbots at a few Beijing’s fish markets which resulted in banning their sales. Turbot was introduced to Chinese market back in 1992 and due to its low disease resistance, it needed to be fed with medical supplements that had been found to leave carcinogenic residues in the fish’s flesh.

There have been many cases of food poisoning lately in China and the authorities intensified the food safety. Some of the previous poisonings include parasite-infested snails in Beijing, steroid-tainted pork, ducks and hens being fed with cancer-causing Sudan dye to make their eggs red.
In August, forty people got sick from meningitis after eating partially cooked snails at Sichuan restaurants.

China does control every step in fish farming: production of fish feed, use of drugs, breeding, sales but there are no strict market access rules for turbot, so they couldn’t ban even the contaminated fish.

China’s FDA warned the authorities of costal areas like Shandong, Jiangsu, Hebei, Zhejiang, Fujian, Guangdong, Liaoning, and Tianjin to be alert.