The FDA restricted imports of five types of Chinese-raised fish in June 2007, saying many contained chemicals the U.S. does not allow for health reasons, such as long-term cancer risks.
Since then, China's government and seafood producers have stepped up testing and safety controls, and the percentage of shipments testing positive for the drugs has dropped from about 25% to less than 6%, says Don Kraemer, deputy director of the FDA's Office of Food Safety.