Heavy metals like mercury are a serious problem in seafood, particularly in the top of the food chain predatory fish (as well as sharks and marine mammals) because of a natural process called bioaccumulation.

Understanding FDA reference dose for mercury and its impact on seafood consumption for pregnant women and children

The U.S. Food and Drug Administration (FDA) has embarked on a significant initiative to gain a deeper understanding of mercury levels in various seafood products available to American consumers.