| http://www.w3.org/ns/prov#value | - But health experts are concerned about high levels of mercury in certain wild fish, and about concentrations of pesticides and industrial pollutants such as PCBs (polychlorinated biphenyls) and dioxins in farmed fish.Farmed fish has about 10 times the concentration of PCBs, dioxins and pesticides that wild salmon has, says David Carpenter, director of the Institute for Health and the Environment
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