Atlantic croaker is not high in mercury. With an average mercury concentration of 0.069 parts per million (ppm), it ranks among the lowest-mercury fish you can eat and falls into the FDA’s “Best Choice” category. However, there’s an important distinction: white croaker (also called Pacific croaker) contains roughly four times more mercury, averaging 0.287 ppm, which bumps it down to “Good Choice” status. The species you’re eating matters.
How Croaker Compares to Other Fish
To put those numbers in context, the FDA considers any fish averaging below about 0.15 ppm mercury a “Best Choice,” meaning you can safely eat two to three servings per week. Atlantic croaker at 0.069 ppm sits comfortably in that range, alongside other popular low-mercury options like salmon, tilapia, and shrimp. Even the highest individual Atlantic croaker sample the FDA tested came in at just 0.193 ppm, based on 90 fish sampled between 2002 and 2011.
White croaker is a different story. At 0.287 ppm on average, with samples ranging from 0.18 to 0.41 ppm, it lands in the “Good Choice” tier. That means one serving per week is the recommended limit for adults who are pregnant or nursing, and for young children. It’s still not a high-mercury fish (those start around 0.5 ppm and above, like swordfish, shark, and king mackerel), but it’s moderate enough to warrant some portion control.
Atlantic vs. White Croaker
The two species live in very different waters and accumulate mercury at different rates. Atlantic croaker is found along the eastern U.S. coast, from the Mid-Atlantic down through the Gulf of Mexico. It’s a relatively short-lived fish with a maximum lifespan of about five years, which limits how much mercury it can accumulate over its lifetime. It feeds on worms, crustaceans, and small fish near the bottom, all relatively low on the food chain.
White croaker, found along the Pacific coast from California northward, tends to carry higher mercury levels. If you’re buying croaker at a market or ordering it at a restaurant on the West Coast, you’re more likely getting white croaker. On the East Coast or Gulf Coast, it’s almost certainly Atlantic croaker. Knowing which species you’re eating is the single most useful thing you can do when managing mercury intake from croaker.
Regional Advisories to Know About
Even for low-mercury species like Atlantic croaker, local conditions can shift the picture. Maryland’s Department of the Environment, for example, issues specific meal recommendations for croaker caught in different parts of the Chesapeake Bay. In the lower Chesapeake Bay and its tributaries, the advisory suggests limiting Atlantic croaker to about six meals per month for the general population, with slightly lower limits for children (five meals per month). In the upper Chesapeake Bay, there’s no limit for most adults.
These advisories factor in not just mercury but other regional contaminants like PCBs that can accumulate in bottom-feeding fish. If you’re catching your own croaker rather than buying commercially sourced fish, checking your state’s fish consumption advisory is worth the two minutes it takes. Most state environmental agencies publish searchable databases online by species and water body.
Nutritional Profile of Croaker
Beyond being low in mercury, Atlantic croaker provides a modest amount of omega-3 fatty acids. A 100-gram serving (roughly 3.5 ounces) delivers about 0.2 grams of combined EPA and DHA, the two omega-3s most beneficial for heart and brain health. That’s lower than fatty fish like salmon or mackerel, which can provide 1 to 2 grams per serving, but it still contributes meaningfully if you eat croaker regularly. Croaker is also a lean source of protein, making it a solid everyday fish for people who want the benefits of seafood without worrying about contaminant levels.
The combination of low mercury and decent nutrition is exactly why the FDA encourages eating “Best Choice” fish like Atlantic croaker two to three times per week. The health benefits of eating fish at that frequency, particularly for heart health and during pregnancy for fetal brain development, consistently outweigh the minimal mercury exposure from low-concentration species.
Keeping Mercury Exposure Low
If you eat croaker often, a few practical habits help keep your overall mercury intake in check. Vary your seafood choices rather than eating the same species every meal. Larger, older fish within any species tend to carry more mercury than smaller ones, so choosing smaller croaker when possible provides a slight edge. And if you eat a mix of low-mercury fish (like Atlantic croaker, shrimp, and catfish) alongside the occasional moderate-mercury species (like white croaker or snapper), your weekly average stays well within safe limits.
For most people, Atlantic croaker is one of the safest fish available in terms of mercury. White croaker requires a bit more awareness but is still far from the high-mercury species that genuinely warrant concern.