Sturgeon falls in the low-to-moderate range for mercury among commonly eaten fish. Average mercury levels in sturgeon muscle typically measure between 0.069 and 0.177 parts per million (ppm), well below the FDA’s action level of 1.0 ppm. That said, sturgeon have biological traits that can push their mercury levels higher than average under certain conditions, making the answer more nuanced than a simple yes or no.
How Sturgeon Compare to Other Fish
To put sturgeon’s mercury numbers in context, high-mercury fish like swordfish, shark, and king mackerel regularly exceed 0.5 ppm and can top 1.0 ppm. Tuna species range from about 0.12 ppm (canned light) to over 0.35 ppm (bigeye). Sturgeon’s typical range of 0.069 to 0.177 ppm places it closer to salmon and tilapia than to the fish most people worry about.
A study of lake sturgeon across four river systems in Manitoba found individual fish ranged from below the detection limit (0.005 ppm) all the way up to 0.698 ppm. That upper end approaches moderate-concern territory, but the averages stayed comfortably low. The wide range reflects something important about sturgeon biology: not all sturgeon carry the same mercury load.
Why Some Sturgeon Accumulate More Mercury
Sturgeon are unusually long-lived fish. Some species survive for decades, and a few can live past 100 years. They mature late, grow large, and feed along the bottom of rivers and lakes where mercury-contaminated sediments collect. All of these traits make sturgeon more susceptible to mercury buildup than shorter-lived species.
Research on white sturgeon in the Columbia River found a clear relationship between a fish’s age and the mercury concentration in its tissues. Mercury accumulated continuously throughout the fish’s life, meaning older, larger sturgeon carried measurably more mercury than younger ones. This pattern holds across fish species generally, but it’s especially relevant for sturgeon because they can live so long. A five-year-old farmed sturgeon and a 40-year-old wild sturgeon from a polluted river are very different fish when it comes to mercury exposure.
Farmed Sturgeon vs. Wild Sturgeon
If you’re buying sturgeon at a grocery store or restaurant, there’s a good chance it was farmed. This matters for mercury. A large study of fish sold in Poland found that farmed fish averaged just 0.014 ppm of mercury, compared to 0.071 ppm for wild-caught fish. Among the farmed freshwater species tested, sturgeon had the highest mercury content, but that peak was still only 0.056 ppm, a very low number.
Farmed sturgeon are harvested young, typically at a few years of age, before significant mercury accumulation occurs. They also live in controlled water environments rather than waterways that may carry industrial contamination. For most consumers, farmed sturgeon represents a low-mercury choice.
Regional Advisories for Wild Sturgeon
Wild sturgeon mercury levels depend heavily on where the fish lives. The Oregon Health Authority, for example, recommends limiting consumption of sturgeon caught in the middle Columbia River due to moderate levels of mercury and PCBs. Similar advisories exist for sturgeon in parts of the Great Lakes, the San Francisco Bay Delta, and other waterways with histories of industrial pollution.
If you catch your own sturgeon or buy from a local fishery, check your state or provincial fish consumption advisories. These are usually searchable by water body and species, and they’ll tell you how many servings per month are considered safe for adults, children, and pregnant women. The mercury risk from wild sturgeon is less about the species itself and more about the specific water it came from.
What About Caviar?
Sturgeon caviar deserves a separate mention. A study of wild Persian sturgeon caviar from the Caspian Sea found mercury levels between 1.39 and 1.50 ppm, which exceeds the international safety thresholds set by the FAO and WHO. The researchers specifically noted that mercury was the only metal in the caviar that exceeded safe limits.
This sounds alarming, but portion size provides important context. A typical serving of caviar is about 15 to 30 grams, a fraction of a standard fish serving (roughly 170 grams). Even at elevated concentrations, the total mercury consumed from a small amount of caviar is far less than what you’d get from a full portion of a moderate-mercury fish. Still, if you eat caviar regularly rather than as an occasional indulgence, the exposure adds up, and wild-sourced caviar from polluted waters carries the highest risk.
Sturgeon’s Nutritional Upside
Sturgeon provides roughly 1.5 grams of omega-3 fatty acids per 100-gram serving, according to data compiled by Oregon State University. That’s a strong number, comparable to sockeye salmon and well above most white fish. About 0.5 grams comes from EPA and 1.0 gram from DHA, the two omega-3 forms your body uses most readily for heart and brain health.
This favorable omega-3 to mercury ratio is one reason sturgeon remains a recommended fish in most guidelines. France’s national health guidance does list sturgeon among species that pregnant and breastfeeding women should limit to 150 grams per week, grouping it with other moderate-concern fish like tuna, halibut, and pike. But that’s a precautionary limit for a sensitive population, not a warning against eating sturgeon in general.
Practical Takeaways for Eating Sturgeon
For most people, sturgeon is a safe, nutritious fish to eat regularly. A few factors shift the mercury picture:
- Farmed sturgeon is consistently low in mercury, typically under 0.06 ppm.
- Wild sturgeon from clean waters averages below 0.2 ppm, which is still a low-risk range.
- Wild sturgeon from polluted rivers can reach 0.5 to 0.7 ppm in older, larger fish. Follow local advisories.
- Caviar from wild sturgeon may contain higher mercury concentrations, though typical serving sizes are small enough to limit actual exposure.
Choosing younger, smaller sturgeon (or farmed fish) and checking regional advisories for wild-caught fish are the simplest ways to keep your mercury intake low while enjoying a fish that delivers excellent omega-3 content.