“Organic salmon” sold in U.S. markets and restaurants is coming from Canada, Ireland, Scotland, and Chile where foreign certification bodies have announced their own ‘organic’ standards for farmed salmon despite the fact that there are no internationally agreed upon standards in place. Often, the standards used by these foreign certifiers differ significantly from what many American consumers associate with the USDA organic label.
In this study [ Environ. Sci. Technol. 2006, 40, 5347-5354] the highest concentrations of PCBs, dioxin-like PCBs, and DDT were found in organically farmed Norwegian salmon. These observations suggest that purchasing higher priced organically farmed salmon does not necessarily protect the consumer from toxic exposure. Source: Pure Salmon Campaign