Farmed Atlantic salmon contain low levels of mercury that are significantly below Health Canada guidelines.

In fact, farmed salmon was rated as the fish with the lowest mercury levels of all the fish tested in a study conducted by the Institute of Medicine.  Salmon are fast growing fish and since contaminants bio-accumulate over time, salmon exhibit low levels of mercury, and other trace metals as well.

 Another recent study published in the Journal of Environmental Toxicology and Chemistry states that farmed salmon exhibit metal levels that are equivalent to or lower than, that observed in other foods such as fruits, vegetables, dairy, honey and meats and concludes:

"Estimates of human dietary exposure indicate that human health risks associated with trace metal exposure via consumption of farmed and wild British Columbia salmon are negligible." - Barry C. Kelly, Michael G. Ikonomou, David A. Higgs, Janice Oakes, and Cory Dubetz.  (2008).