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Food ingredient · Fish

High-mercury fish

Fish on the FDA/EPA list with the highest mercury levels.

  • High-mercury fish
  • Whole food
  • Expert review pending
Low concern Level 1 of 4 How concern levels work

A minor or very limited concern, such as being an ultra-processing marker only. The concern level sets how many points high-mercury fish costs on a product’s receipt.

What the evidence says

  • High mercuryStrong evidence

    The FDA and EPA list these fish as choices to avoid because they have the highest mercury levels; the NHS advises avoiding shark, swordfish and marlin in pregnancy. [1][2]

Evidence tiers say how sure the evidence is, separately from how much it matters. About evidence tiers.

Diets and allergens

Vegan
No
Vegetarian
No
Gluten-free
Yes
Allergen
Fish

For the ingredient in general. Always check the package: a product’s own labels win.

Names GoodSwap recognizes on labels (9)
  • shark
  • marlin
  • tilefish
  • swordfish
  • bigeye tuna
  • king mackerel
  • orange roughy
  • high mercury fish
  • tilefish gulf of mexico

Sources

  1. Advice about Eating Fish (FDA/EPA)

    U.S. Food and Drug Administration · Regulator

    “King mackerel Choice to Avoid: HIGHEST MERCURY LEVELS”

    fda.gov

  2. Foods to avoid in pregnancy

    NHS (UK) · Jun 15, 2026 · Regulator

    “Liver and foods containing liver have high levels of vitamin A, which can be harmful to your baby.”

    nhs.uk