Importing bad news
Some 85 percent of the seafood Americans consume is imported. And much of that is farm-raised (a practice called aquaculture) in Asia and elsewhere in the developing world. The problem is that other countries may have different standards for aquaculture, sometimes employing drugs banned here. In addition, most overseas fish farms are not inspected by U.S. officials. Moreover, though the government can detain suspect food imports without examining them (based on a history of prior recalls, for instance), only a fraction of imported seafood is actually tested for drug residues when it enters the country.
In fact, the Food and Drug Administration (FDA) checks just two percent of imports for contaminants (including drug residues, microbes and heavy metals), the study reported, compared to 20 to 50 percent in Europe, 18 percent in Japan and up to 15 percent in Canada. And when the FDA does inspect seafood imports, it looks for residues from only 13 drugs. In contrast, Europe tests for 34 drugs. That means overseas fish farms can be using a range of drugs for which the U.S. doesn’t even screen.
Last spring, the U.S. Government Accountability Office reported that only 0.1 percent of imported seafood was inspected specifically for drug residues in 2009 and concluded that the FDA’s oversight of the safety of imported seafood is limited—an understatement, indeed.
Shrimp top the list
Though seafood violations varied depending on the different inspection systems used across countries, the Hopkins researchers found that shrimp and prawns, overall, exceeded drug residue limits most frequently. Other problematic imported seafood included crab, basa (a type of catfish), eel and tilapia, most or all likely farmed. Of all countries, Vietnam had the most drug violations, followed by China and then other countries in Asia, including Thailand, Indonesia, Taiwan, India and Malaysia.
Antibiotics, antifungals and antiparasitics, as well as pesticides and disinfectants, are often used in fish farming to control diseases that can spread rampantly in crowded conditions. While routine exposure to such substances can pose a risk to aquaculture workers, the health effects of chronic low-level exposure in fish eaters are not fully known. At the very least, widespread use of antibiotics in aquaculture can contribute to the development of antibiotic-resistant bacteria and cause important antibiotic drugs to become ineffective in people.
http://www.berkeleywellness.com/hea...mported-seafood