Because sharks have very high levels of mercury, they mature and reproduce more slowly, and overfishing has also depleted their population.
11. Atlantic Bluefin Tuna:
Bluefin tuna is currently considered a highly endangered species. It is also a large predatory fish, and therefore contains high levels of mercury.
12. Swordfish
Another predatory fish species, mercury, is a major concern here. In fact, EDF has suggested that women and children avoid swordfish altogether, and men should eat it no more than once a month.
13. King mackerel
Both king mackerel and Spanish mackerel contain high levels of mercury and should be avoided, especially by women and children.
14.
Groper Groper has moderately high levels of mercury and is susceptible to overfishing.[7] It is also a frequent victim of seafood fraud. The "groper" sold may actually be a cheaper fish that is mislabeled. One study found that up to 87% of seafood products such as groper, cod, and snapper may be mislabeled.
A Note on the Role of Selenium in Mercury Toxicity
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