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10. Shark
Since sharks are at the top of the food chain, they have very high levels of mercury [7]. They are also slow to mature and reproduce, and thus overfishing has depleted their populations as well.
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11. Atlantic Bluefin Tuna
Bluefin tuna have been severely overfished, and are now considered to be highly vulnerable to extinction [12]. They are also large predatory fish and thus contain high levels of mercury [7].
12. Swordfish
Another predatory fish, mercury is the main concern here. In fact, the EDF has recommended that women and children avoid swordfish altogether and men consume it no more than once per month [13].
13. King Mackerel
Both King Mackerel and Spanish Mackerel have high levels of mercury and should be avoided, especially by women and children [7].
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