You can continue enjoying seafood while reducing unnecessary mercury exposure.
First, choose variety. Eating different lower-mercury species reduces the chance of repeatedly consuming a fish with relatively high mercury levels.
Second, pay attention to portion sizes. Even lower-mercury fish should be eaten in sensible amounts according to relevant dietary guidance.
Third, check local advisories. Fish caught by recreational anglers may be subject to specific warnings because of contamination in particular waterways.
Fourth, remember that fish has benefits. Seafood provides nutrients that are difficult to obtain in the same combination from many other foods. Avoiding every type of fish is generally unnecessary.
Finally, ask questions. If you are unsure what species you are buying, ask the seller rather than relying on a general market name.
Final Thoughts: Choose Seafood With Knowledge, Not Fear
Fish can be an important part of a balanced diet, but choosing the right species matters.
King mackerel, swordfish, shark, Gulf of Mexico tilefish, and bigeye tuna are among the fish that people following FDA pregnancy and childhood seafood guidance should avoid because of their relatively high mercury levels.
At the same time, salmon, sardines, shrimp, trout, tilapia, and other lower-mercury options can provide valuable nutrients with less concern about mercury exposure.
The most important lesson is simple: You do not need to stop eating fish. You need to know which fish you are eating, how often you eat it, and whether it is appropriate for your stage of life.
A little knowledge at the seafood counter can help protect your family's health while allowing everyone to enjoy the nutritional benefits of seafood.
More Ways to Reduce Mercury Exposure When Eating Fish
Understanding which fish contain high levels of mercury is only the first step. Making safer seafood choices also involves knowing how to shop, store, prepare, and serve fish at home.
Here are several additional points that can help protect your family while allowing you to enjoy seafood as part of a balanced diet.
1. Learn to Read Seafood Labels Carefully
One of the most practical ways to reduce mercury exposure is to identify the exact fish species before purchasing it.
In some markets, several different species may be sold under similar common names. This can make it difficult for consumers to distinguish between fish with very different mercury levels.
For example, the word "tuna" can refer to several species, including skipjack, albacore, yellowfin, and bigeye. Their mercury concentrations are not identical.
Similarly, not every type of mackerel has the same mercury profile. Atlantic mackerel is generally a lower-mercury choice, while king mackerel is considered a high-mercury fish.
When shopping, consider asking:
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What is the exact species of this fish?
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Where was it caught or farmed?
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Is there any local seafood safety advisory?
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Is the fish covered by a recognized mercury consumption recommendation?
If the seller cannot provide enough information, choosing a clearly identified alternative may be a sensible decision.
2. Be Careful With Large Fish Caught in Local Waters
Not all mercury exposure comes from seafood purchased in supermarkets or restaurants. Fish caught by family members, recreational anglers, or small local fishing operations can also contain contaminants.
Mercury pollution varies from one waterway to another. Certain rivers, lakes, reservoirs, and coastal areas may have contamination concerns related to industrial activity, mining, or other environmental sources.
This means that a fish species considered relatively low in mercury in one location may still be subject to a local consumption advisory elsewhere.
Before eating fish caught in unfamiliar waters, check local environmental and public health recommendations. Pay particular attention to advice for pregnant women and children.
If no reliable information is available, it is better to avoid eating large quantities of fish from waters with uncertain contamination histories.
3. Farmed Fish and Wild-Caught Fish: Which Is Safer?
Consumers sometimes assume that wild-caught fish always contain more mercury than farmed fish, or that farmed fish are automatically free from contamination.
Neither assumption is universally correct.
Mercury levels depend on several factors, including the species, its diet, its size, and the environment in which it lives.
Some farmed fish may have relatively low mercury levels because of their species and feed. However, farming does not guarantee that every fish will be free from contaminants.
Likewise, wild-caught fish can be excellent nutritional choices, but some large predatory species naturally accumulate more mercury.
Instead of choosing seafood based only on whether it is farmed or wild-caught, consider the specific species and its known mercury profile.
4. Do Not Confuse Mercury With Other Seafood Contaminants
Mercury is not the only potential food safety concern associated with seafood.
Depending on the species and environment, fish and shellfish may also be affected by other contaminants, including certain industrial chemicals, harmful algae toxins, bacteria, and parasites.
These hazards are different from mercury and require different prevention measures.
For example, proper refrigeration and cooking can reduce the risk of many foodborne infections and parasites. However, ordinary cooking does not reliably remove methylmercury.
Similarly, freezing may help control certain parasites in seafood, but it does not eliminate mercury.
This distinction is important because no single preparation method can protect against every possible seafood hazard.
Safe seafood consumption involves choosing appropriate species, buying from reliable suppliers, maintaining proper storage temperatures, and following recommended cooking practices.
5. Why Pregnant Women Should Not Avoid All Fish
After learning about mercury, some pregnant women may decide to stop eating fish altogether.