Is Swordfish Safe to Eat During Pregnancy?

Overview

Swordfish is a popular seafood choice for its firm texture and mild flavor, but it carries significant risks for pregnant women. According to the FDA and EPA, swordfish should be avoided entirely during pregnancy because of elevated mercury levels that can affect fetal neurodevelopment. Mercury exposure is linked to cognitive delays and other developmental issues, making this fish one of the four species (along with shark, king mackerel, and tilefish) that the FDA explicitly advises against consuming.

Safety Details

The primary concern with swordfish is methylmercury, a neurotoxin that accumulates in large predatory fish. The FDA reports that swordfish contains an average of 0.995 parts per million (ppm) of mercury—far exceeding the 0.1 ppm threshold considered low-mercury. This can cross the placenta and impact the developing brain and nervous system. Unlike listeria risks in deli meats, the issue here is chronic mercury accumulation rather than acute infection. No safe preparation method eliminates mercury, as it binds to the fish tissue.

Risks Explained

• Mercury toxicity: Studies in peer-reviewed journals show prenatal exposure above 0.1 mcg/kg body weight daily can lead to lower IQ scores.
• ACOG alignment: The American College of Obstetricians and Gynecologists supports FDA limits, recommending zero consumption of high-mercury fish.

Trimester Guide

First trimester: Mercury exposure is especially critical as the neural tube forms; complete avoidance is essential. Second trimester: Continued avoidance prevents ongoing accumulation. Third trimester: Brain growth accelerates, so steering clear remains vital until after delivery and breastfeeding. No portion size is considered safe—limits are zero servings per week.