Is Mahi Mahi Safe to Eat During Pregnancy? Mercury and Safety Explained

Yes, mahi mahi is safe to eat during pregnancy, and the FDA classifies it as a “Good Choice” on its official fish safety list. The guidance recommends limiting it to about one serving a week, roughly 4 ounces, rather than the two to three weekly servings allowed for lower-mercury “Best Choice” fish like salmon or tilapia.

Here’s exactly what the FDA and EPA guidance says, why mahi mahi falls into the “Good Choice” tier rather than “Best Choice,” and how to plan servings around it.

Why Mercury Matters During Pregnancy

Mercury crosses the placenta and can affect a developing baby’s nervous system, which is why the FDA and EPA jointly publish fish consumption guidance specifically for people who are pregnant, breastfeeding, or trying to become pregnant, along with young children. The guidance sorts fish into three tiers, Best Choices, Good Choices, and fish to avoid, based on average mercury content.

Where Mahi Mahi Falls, and Why

Mahi mahi lands in the “Good Choice” tier alongside fish like grouper, snapper, and yellowfin tuna. Fish in this category carry an average mercury concentration between roughly 0.15 and 0.23 ppm, high enough that eating it three times a week could exceed the recommended mercury reference dose, but low enough to be safely included once a week. That’s meaningfully different from “Best Choices” like salmon, shrimp, and tilapia, which carry low enough mercury to be eaten two to three times weekly.

What a Safe Serving Actually Looks Like

The FDA’s guidance translates to one 4-ounce serving of mahi mahi per week, about the size of a deck of cards, as part of a varied diet that also includes lower-mercury “Best Choice” fish. It doesn’t mean mahi mahi needs to be avoided entirely, just that it shouldn’t be the only or primary fish in weekly meal planning during pregnancy or while breastfeeding.

Beyond Mercury: General Food Safety

The same food safety rules that apply to any fish during pregnancy apply to mahi mahi: it should always be fully cooked to an internal temperature of 145°F, never eaten raw or undercooked, and handled with the same care as any other fresh seafood to avoid foodborne illness risk, which is a separate concern from mercury exposure.

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