Nearly all fish and shellfish contain traces of mercury. At KAZ Sushi Bistro, we hear questions about mercury in sushi fish almost every day from concerned guests.
The good news is that for most people, the risk from mercury by eating fish is not a health concern. Fish and shellfish provide high-quality protein, omega-3 fatty acids, and other essential nutrients that support heart health and overall wellness.
This guide covers everything you need to know about mercury in sushi fish 2026. We have reviewed FDA guidelines, examined mercury levels in common sushi varieties, and compiled practical advice for sushi lovers who want to enjoy their favorite dishes safely.
Table of Contents
What Is Mercury in Sushi Fish?
Mercury is a naturally occurring heavy metal found in rocks, soil, and water. When mercury enters oceans, lakes, and streams, bacteria convert it into methylmercury. This organic form of mercury is what builds up in fish tissue over time.
Methylmercury is a neurotoxin that can affect the nervous system, particularly in developing brains. It binds to proteins in fish muscle tissue, which means you cannot cook or prepare it away. The mercury is there when the fish is caught, and it stays there.
Here is how mercury accumulates in fish. Small fish absorb tiny amounts of methylmercury from the water and their food. When larger fish eat those smaller fish, they absorb the mercury that has already accumulated. This process continues up the food chain.
The result is bioaccumulation. Large predatory fish that live longer accumulate the highest mercury levels because they have consumed thousands of smaller fish over many years. This is why a massive bluefin tuna contains far more mercury than a small salmon.
Mercury levels are measured in parts per million, or ppm. The FDA has set a limit of 1.0 ppm for mercury in commercial fish. Fish with levels below 0.15 ppm are considered low in mercury, while those above 0.5 ppm are considered high.
FDA and EPA Guidelines for Fish Consumption 2026
The FDA and EPA provide clear guidance on fish consumption to minimize mercury exposure while maximizing nutritional benefits. These agencies recommend that most people eat 8 to 12 ounces of fish per week, which equals 2 to 3 average meals.
The guidelines break down into three simple recommendations. First, do not eat shark, swordfish, king mackerel, or tilefish. These four fish contain the highest mercury levels and should be avoided entirely by pregnant women, nursing mothers, and young children.
Second, eat up to 12 ounces per week of a variety of fish and shellfish that are lower in mercury. Good choices include shrimp, canned light tuna, salmon, pollock, and catfish. Albacore tuna has more mercury than canned light tuna, so limit albacore to 6 ounces per week.
Third, check local advisories about the safety of fish caught by family and friends in local lakes, rivers, and coastal areas. If no advice is available, limit consumption of these fish to 6 ounces per week and avoid eating any other fish that week.
For sushi specifically, these guidelines translate to roughly 2 to 3 sushi meals per week if you choose low-mercury options. Many of our regular guests at KAZ Sushi Bistro eat sushi weekly without issues by following these simple rules.
High-Mercury Fish to Avoid
Four fish stand out as having dangerously high mercury levels. The FDA and EPA specifically warn against eating shark, swordfish, king mackerel, and tilefish. These fish consistently test above 0.5 ppm mercury, with some shark species reaching over 1.0 ppm.
Shark contains an average of 0.98 ppm mercury, making it one of the most contaminated fish in the ocean. Swordfish averages around 0.97 ppm. King mackerel, not to be confused with the smaller Atlantic mackerel, averages 0.73 ppm. Tilefish from the Gulf of Mexico can exceed 1.45 ppm.
These fish are large, long-lived predators at the top of the food chain. A swordfish can live up to 9 years and grow over 14 feet long. During that time, it consumes massive amounts of smaller fish, accumulating mercury with every meal.
Are these fish common in sushi? Generally no. You will rarely see shark or swordfish at reputable sushi restaurants in the United States. King mackerel appears occasionally, but most sushi establishments avoid it. Tilefish is virtually never served as sushi.
However, some specialty rolls or higher-end omakase experiences might include these fish. Always ask your sushi chef what species they are serving if you are uncertain. At KAZ Sushi Bistro, we do not serve any of these high-mercury fish.
Low-Mercury Sushi Fish You Can Enjoy
Salmon is one of the safest sushi fish you can eat. With mercury levels averaging just 0.02 ppm, salmon contains 25 times less mercury than shark. Farmed salmon often has even lower levels because their feed is controlled and their lifespan is shorter than wild salmon.
We hear many customers ask about salmon specifically, and the answer is reassuring. Based on forum discussions and scientific data, regular salmon consumption poses minimal mercury risk. You could eat salmon sushi several times per week and stay well below FDA limits.
Shrimp and other shellfish are also excellent low-mercury choices. Shrimp averages 0.01 ppm mercury, making it one of the safest seafood options available. Scallops, crab, and squid all test below 0.05 ppm mercury.
Tuna deserves special attention because it is the most popular sushi fish and varies widely in mercury content. Canned light tuna, made primarily from skipjack, averages 0.13 ppm. Yellowfin tuna averages 0.35 ppm. Bigeye tuna, often used for fatty tuna, averages 0.57 ppm. Bluefin tuna can exceed 0.8 ppm.
Yellowtail, another sushi favorite, contains about 0.30 ppm mercury. This places it in the moderate range. Eating yellowtail occasionally is fine for most people, but pregnant women should limit it. Eel, or unagi, averages around 0.08 ppm and is considered a safe choice.
Here is a quick reference for common sushi fish mercury levels in parts per million: Salmon 0.02, Shrimp 0.01, Eel 0.08, Scallop 0.03, Canned light tuna 0.13, Yellowfin tuna 0.35, Yellowtail 0.30, Bigeye tuna 0.57, Bluefin tuna 0.80+.
Mercury Poisoning Symptoms to Watch For
Mercury poisoning from fish is rare but worth understanding. Symptoms typically develop gradually over weeks or months of consistently eating high-mercury fish. Most people who eat a varied diet with primarily low-mercury fish never experience these symptoms.
Neurological symptoms are the most common signs of mercury toxicity. These include anxiety, irritability, mood swings, memory problems, difficulty concentrating, and tremors. Some people experience numbness or tingling in their hands, feet, or around the mouth.
Physical symptoms can include vision changes, hearing problems, and poor coordination. In severe cases, mercury poisoning can cause muscle weakness, speech difficulties, and impaired walking. These advanced symptoms require immediate medical attention.
If you are concerned about your mercury levels, a simple blood test can measure your current exposure. Normal blood mercury levels are below 10 micrograms per liter. Levels above 50 micrograms per liter indicate toxicity requiring medical intervention.
The good news is that mercury levels decrease naturally when you stop eating high-mercury fish. Your body eliminates mercury over time, so switching to low-mercury options can reverse the accumulation. Most people see significant improvement within a few months.
Sushi and Mercury: Special Considerations for Pregnancy
Pregnant women, women who may become pregnant, nursing mothers, and young children need to be especially careful about mercury. Methylmercury crosses the placenta and can affect the developing nervous system of an unborn baby.
The FDA and EPA recommend that these groups follow the same basic guidelines: avoid shark, swordfish, king mackerel, and tilefish entirely. They should also limit albacore tuna to 6 ounces per week and enjoy up to 12 ounces total of other low-mercury fish.
For pregnant women who love sushi, focus on salmon, shrimp, eel, and scallops. These fish provide essential omega-3 fatty acids that support fetal brain development while keeping mercury exposure minimal. A pregnant woman can safely enjoy 2 to 3 sushi rolls per week made with these fish.
Some doctors advise pregnant women to avoid all raw fish due to foodborne illness risk, not mercury. This is a separate concern from mercury toxicity. Cooked sushi options like eel, shrimp tempura rolls, and vegetable rolls eliminate both the mercury and food safety concerns.
Breastfeeding mothers should follow the same guidelines as pregnant women. Mercury can pass through breast milk, though in smaller amounts than through the placenta. Maintaining a diet rich in low-mercury fish ensures your baby gets the nutritional benefits without the risks.
Young children should eat smaller portions appropriate for their body weight. The FDA recommends 2 to 3 ounce servings for children, with 1 to 2 servings per week of low-mercury fish. Avoid giving children any high-mercury fish until they are older.
Frequently Asked Questions About Mercury in Sushi
Is sushi safe to eat regarding mercury?
Yes, sushi is generally safe to eat when you choose low-mercury fish. Most sushi restaurants primarily serve salmon, tuna, yellowtail, and shrimp, which are safe for most people in moderation. The key is variety and portion control. Eating 2 to 3 sushi meals per week with low-mercury options like salmon and shrimp poses minimal risk for healthy adults.
Why should pregnant women avoid certain sushi?
Pregnant women should avoid high-mercury fish because methylmercury can cross the placenta and harm the developing nervous system of the unborn baby. The four fish to completely avoid are shark, swordfish, king mackerel, and tilefish. Pregnant women should also limit albacore tuna to 6 ounces per week. Safe options include salmon, shrimp, and eel.
What are the 4 fish to avoid for mercury?
The four fish to avoid due to high mercury levels are: 1) Shark, averaging 0.98 ppm mercury, 2) Swordfish, averaging 0.97 ppm mercury, 3) King Mackerel, averaging 0.73 ppm mercury, 4) Tilefish, averaging 1.45 ppm mercury. These large predatory fish accumulate the highest mercury levels because they live long and consume many smaller fish.
Which sushi fish is safest to eat?
Salmon is the safest sushi fish, containing only 0.02 ppm mercury on average. Other safe options include shrimp at 0.01 ppm, eel at 0.08 ppm, and scallops at 0.03 ppm. These fish provide excellent nutrition with minimal mercury risk. You can safely eat these fish multiple times per week without approaching FDA mercury limits.
Which sushi fish is lowest in mercury?
Shrimp contains the lowest mercury levels among common sushi fish at approximately 0.01 parts per million. Salmon follows closely at 0.02 ppm, then scallops at 0.03 ppm. Eel is also low at 0.08 ppm. These fish are excellent choices for frequent sushi eaters and pregnant women who need to minimize mercury exposure.
Can you get mercury poisoning from eating too much sushi?
Mercury poisoning from sushi is possible but rare. It typically requires consistently eating high-mercury fish like bluefin tuna or bigeye tuna in large quantities over an extended period. Most sushi lovers eat a variety of fish, which reduces risk. Symptoms include anxiety, memory problems, and tremors. If you eat sushi daily, focus on salmon and shrimp to minimize risk.
Conclusion
Understanding mercury in sushi fish helps you make informed choices without giving up the cuisine you love. The key takeaways are simple: avoid shark, swordfish, king mackerel, and tilefish; enjoy salmon, shrimp, and eel freely; and limit high-mercury tuna varieties to occasional treats.
At KAZ Sushi Bistro, we are committed to serving high-quality, safe sushi that you can enjoy with confidence. By following the FDA and EPA guidelines outlined in this article, you can continue to enjoy mercury in sushi fish safely 2026 and for years to come.