Highest and lowest risk fish
In general, larger predatory fish have higher mercury levels because they often feed on smaller fish, each of which has a lower level. They also live longer, during which time mercury continues to accumulate. This is how humans can end up with too much mercury if they eat a lot of fish.
But, says Eric Rimm, professor of epidemiology and nutrition at the Harvard School of Public Health, “for most people it’s good to eat fish every day.” Except for pregnant women and children, you can safely eat fish every day. Mercury poisoning, as long as you limit the amount of mercury-rich fish to two servings per week.
Low mercury fish: salmon, shrimp, catfish, scallops, oysters, herring, and trout
Fish with high mercury content: swordfish, king mackerel, sharks, carolins, shallot, marlin, ahi and bigeye.
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