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Seafood offers valuable nutrients like omega-3 fatty acids, high-quality protein, and essential vitamins, supporting heart and brain health. However, certain fish pose significant risks due to high mercury levels, environmental contaminants, unsustainable fishing practices, or poor aquaculture conditions. Understanding which fish to avoid helps minimize health risks, particularly for pregnant women, nursing mothers, young children, and anyone concerned about long-term toxin exposure.

### High-Mercury Fish: The Top Choices to Avoid
Large, long-lived predatory fish accumulate the highest levels of methylmercury, a neurotoxin that can harm developing brains and nervous systems. According to the latest FDA and EPA guidelines, these species belong in the “Choices to Avoid” category and should be eliminated from the diet of sensitive groups.

– **Shark**: Extremely high in mercury and often overfished.
– **Swordfish**: A classic high-mercury predator with levels that make it unsuitable for regular consumption.
– **King Mackerel**: Particularly risky, especially varieties from certain regions.
– **Tilefish** (Gulf of Mexico): One of the highest mercury concentrations recorded.
– **Marlin**: Large size leads to heavy bioaccumulation of toxins.
– **Orange Roughy**: Can live over 150 years, allowing decades of mercury buildup; also vulnerable to overfishing.
– **Bigeye Tuna**: High-mercury steaks and sushi-grade portions should be avoided.

Albacore (white) tuna and yellowfin tuna fall into a “limit” category—sensitive individuals should consume them no more than once per week.

### Farmed and Imported Seafood with Quality Concerns
Farming practices, water quality, and regulatory oversight vary widely. Many imported options carry risks from antibiotics, pollutants, and environmental damage.

– **Imported Farmed Shrimp**: Much of the supply (especially from certain Asian and Latin American sources) comes from farms linked to mangrove destruction, heavy chemical use, and low inspection standards.
– **Imported Catfish** (such as basa or swai from Vietnam): Frequently associated with banned substances and hygiene issues.
– **Farmed Atlantic Salmon**: May contain higher levels of contaminants and antibiotics compared to wild Pacific varieties, depending on farm standards.
– **Tilapia** (mostly farmed): Often has an imbalanced omega-6 to omega-3 fatty acid ratio that could promote inflammation; truly wild-caught tilapia is uncommon.

### Overfished and Ecologically Vulnerable Species
Sustainability matters for ocean health. These fish face population declines or destructive harvesting methods.

– **Atlantic Cod**: Stocks have struggled due to historical overfishing and slow recovery.
– **Bluefin Tuna**: Severely depleted in many regions; critically endangered populations exist.
– **Chilean Sea Bass** (Patagonian toothfish): Slow-growing and heavily pressured by illegal fishing.
– **American Eel**: High in contaminants and often overharvested.

Wild sturgeon caviar also falls into this category due to threatened populations.

### Additional Risks to Watch For
– **Freshwater fish** from polluted rivers or lakes may contain high levels of PFAS (“forever chemicals”) or local toxins—always check state-specific advisories.
– Tropical reef fish like certain grouper or barracuda can carry ciguatera toxin, causing severe food poisoning.

### Making Smarter Seafood Choices
The good news is that plenty of delicious, nutritious options remain. The FDA and EPA recommend 2–3 servings per week from “Best Choices” for most adults, with adjustments for children. Excellent lower-mercury, sustainable picks include:

– Wild Alaskan salmon
– Sardines and anchovies
– Pacific cod
– Atlantic mackerel (not king)
– Oysters, scallops, and U.S.-sourced shrimp
– Trout

Look for certifications like ASC (Aquaculture Stewardship Council) or MSC (Marine Stewardship Council) to support responsible practices. Vary your seafood selections to spread out any potential exposure, and consult tools like the Monterey Bay Aquarium’s Seafood Watch for region-specific ratings.

By avoiding the highest-risk fish and prioritizing well-managed sources, you can enjoy seafood’s benefits while protecting your health and the oceans. For the most up-to-date recommendations, refer directly to FDA.gov or EPA.gov fish advisory pages. Smart choices ensure seafood remains a safe and enjoyable part of a balanced diet.