According to the Natural Resources Defense Council, the fish with the highest mercury content per capita include the Ahi Bigeye, King Mackerel, Marlin, Orange Roughy, Shark, Swordfish, Tilefish and Tuna. The Tilefish from the Gulf of Mexico have the highest recorded levels of mercury at 1.45 parts per million, followed by Shark with .988 ppm and Swordfish with .976 ppm.
The fish with the most mercury are the biggest fish. This is because mercury accumulates throughout that fishes life. A big fish eats many small fish and ingests their mercury and these levels will continue to build throughout the big fish’s life. This is known as bio-accumulation.
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