There are many health benefits to eating fish. Not only are the omega-3 fatty acids in fish good for your heart, they also help reduce inflammation which is the cause of many degenerative diseases. Therefore, if you are health-conscious, you have probably been eating more fish and seafood on a regular basis. However, do you know that your heart-healthy seafood may also contain many unsavory contaminants that pose threats to your health? Nowadays, drug residues are commonly found in many imported farm-raised seafood and mercury in almost all ocean fish species.
So what kinds of seafood are the most contaminated and what are still safe to eat?
Imported Farmed Seafood… Questionable
Some 85% of the seafood Americans consume is imported. Much of that is farm-raised, in a practice called aquaculture, in Asia and other countries. The problem with farm-raised seafood is the environment in which the seafood is raised. Veterinary drugs like antibiotics, anti-fungals, anti-parasitics, pesticides, and disinfectants are frequently used to treat or prevent a wide array of production-related diseases that can spread rampantly in overcrowded conditions. In addition, many developing countries employ drugs that have been banned in the U.S. A study from the Johns Hopkins Center for a Livable Future was published in the July 2011 issue of Environmental Science & Technology. It characterizes veterinary drug inspection policies and violations among four inspecting bodies – E.U., U.S., Canada, and Japan, using government collected data from 2000 to 2009. The following findings reveal major concerns regarding the safety of imported seafood:
Most overseas fish farms are not inspected by U.S. officials. Moreover, the FDA (U.S. Food and Drug Administration) checks just 2 percent of imports for contaminants (including drug residues, polychlorinated biphenyls or PCBs, pesticides, and mercury), compared to 20-50% in Europe, 18% in Japan, and up to 15% in Canada. jakers.com has some nice tips on this.
The FDA looks for residues from only 13 drugs, whereas Europe tests for 34 drugs. That means overseas fish farms can be using a range of drugs that the U.S. doesn’t even screen for. Most veterinary drug violations were detected in species that are farm-raised. Shrimp and prawns top the list, followed by crab, basa (catfish), eel, tilapia, and Chilean salmon. Of all the countries, Vietnam had the most drug violations, followed by China, Thailand, Indonesia, Taiwan, India, and Malaysia. Last but not least, contaminants in farmed seafood are not limited to those from developing countries. Farmed salmon from Europe has been found to contain the highest PCBs and other potentially harmful industrial pollutants. PCBs are neurotoxic, hormone-disrupting chemicals. According to one study, PCBs were found at levels seven times higher in farmed salmon than in wild ones.
Ocean Fish… Mercury
Mercury occurs naturally in the environment and can also be released into nature through industrial pollution. Some 2,000 tons of it enter the global environment each year from human-generated sources such as coal-burning power plants and incinerators. Deposited onto land or into water, mercury is picked up by microorganisms, which convert some of it to methyl-mercury, a highly toxic form that builds up in fish and the animals that eat them. One of the primary ways people are exposed to mercury is by eating fish and shellfish. The other common source is from dental amalgam (mercury) fillings. Normally, the human body is capable of removing small amounts of mercury. However, if you are chronically exposed to heavy metals such as mercury or if your body is already loaded with toxins from drugs, alcohol, tobacco, pesticides, chemical-based household cleaners and personal health-care products, your liver and kidneys, the two major detox organs, will likely be heavily burdened. Overtime, their detox function may be compromised, leading to an accumulation of mercury and other toxins in the body.