Can you eat king mackerel while pregnant?
Not advisedSkip king mackerel during pregnancy entirely, because it is one of the highest-mercury fish on the market. The FDA puts it on its "choices to avoid" list, since methylmercury crosses the placenta and can harm a baby's developing brain and nervous system.
Why
The FDA and EPA fish advice names king mackerel in the small group of fish pregnant people should not eat at all, alongside shark, swordfish, tilefish, bigeye tuna, marlin, and orange roughy. These are large, long-lived predators that accumulate methylmercury from everything they eat, and the mercury concentrates in the muscle you would be eating. Because mercury builds up in your body over weeks and passes to the fetus, there is no portion size the FDA considers safe for this species. Note that this is not the same fish as Atlantic or Pacific mackerel, which the FDA lists as a "Best Choice" and actively recommends.
Safer alternatives
- Atlantic mackerel, which the FDA lists as a Best Choice
- Canned light tuna or skipjack, up to 2 to 3 servings a week
- Wild or farmed salmon fillets
- Sardines, trout, or Pacific chub mackerel
Sources
- FDA https://www.fda.gov/food/consumers/advice-about-eating-fish
- NHS https://www.nhs.uk/pregnancy/keeping-well/foods-to-avoid/
Every verdict follows our sourcing methodology: official health guidelines only, most cautious position when they differ.
Last reviewed by the pregAI editorial team.
Frequently asked questions
Is king mackerel the same as regular mackerel?
No, and the difference matters a lot. King mackerel is a large Atlantic predator with very high mercury, while Atlantic mackerel and Pacific chub mackerel are small, low-mercury fish the FDA puts in its Best Choices group. If a menu or fish counter just says "mackerel," ask which species it is.
I ate king mackerel before I knew I was pregnant, is my baby at risk?
One meal is very unlikely to cause harm, because mercury risk comes from repeated exposure building up over time. Your body clears methylmercury slowly, so the practical step is simply to stop eating high-mercury fish from now on. Fill the gap with low-mercury fish rather than cutting fish out.
How much fish should I eat while pregnant instead?
The FDA recommends 8 to 12 ounces a week, which is about two to three servings, from its Best Choices list. Fish supplies omega-3 DHA, iodine, and protein that support fetal brain and eye development, so the goal is swapping species rather than eating less fish.
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