Consumption of fatty fish at least twice a week is recommended to provide omega-3 fatty acids. However, some fish - especially swordfish, shark, king mackerel, and tile fish - can be a source of ____________, which is toxic in high amounts.

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The consumption of fish containing high levels of mercury such as swordfish, shark, king mackerel, and tile fish should be limited to no more than once a month, especially for pregnant women, nursing mothers, and young children, due to the risk of mercury poisoning. Other fatty fish such as salmon, sardines, and trout are safer options as they contain lower levels of mercury and higher levels of omega-3s.

Consumption of Fatty Fish at Least Twice a Week Is