Is mercury naturally occurring in fish?
Nearly all fish contain trace amounts of mercury, but longer-lived predators — like tuna, swordfish and sharks — generally have higher levels.
What does mercury in fish do to you?
Mercury exposure is linked to health issues including poor brain function, anxiety, depression, heart disease and impaired infant development. Though tuna is very nutritious, it’s also high in mercury compared to most other fish. Therefore, it should be eaten in moderation — not every day.
Why is mercury increasing in fish?
Even as mercury levels in the oceans have fallen, levels in some fish—such as tuna, salmon, and swordfish—have increased due to overfishing and climate change, according to a new study.