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Top 10 fish and shellfish consumed in the United States

Mean mercury level in parts per million (ppm) Omega-3 fatty acids
(grams per 3-oz. serving)
Canned tuna (light)
0.12 0.17–0.24
Shrimp ND* 0.29
Pollock 0.06 0.45
Salmon (fresh,frozen) 0.01 1.1–1.9
Cod 0.11 0.15–0.24
Catfish 0.05 0.22–0.3
Clams ND* 0.25
Flounder or sole 0.05 0.48
Crabs 0.06 0.27–0.40
Scallops 0.05 0.18–0.34


Other common seafoods

Mean mercury level in
parts per million (ppm) Omega-3 fatty acids
(grams per 3-oz. serving)
Lobster 0.31 0.07–0.46
Grouper 0.55 0.23
Halibut 0.26 0.60–1.12
Oysters ND* 0.37–1.14
Mahi mahi 0.19 0.13
Herring 0.04 1.9–2.0


Fish with the highest levels of mercury (about 1 ppm Hg)

Mean mercury level in
parts per million (ppm) Omega-3 fatty acids
(grams per 3-oz. serving)
Shark 0.99 0.83
Swordfish 0.97 0.97
Tilefish (golden bass or golden snapper) 1.45 0.90
King mackerel 0.73 0.36

Advice from the FDA
Women who are pregnant, planning to become pregnant or nursing — and young children — should not eat these fish. Everyone else can eat up to 7 ounces of high-mercury fish per week.

Fish with about 0.5 ppm Hg

Mean mercury level in parts per million (ppm) Omega-3 fatty acids
(grams per 3-oz. serving)
Fresh or frozen tuna 0.38 0.21–1.1
Red snapper 0.60 0.29
Orange roughy 0.54 0.028

Advice from the FDA
Minimizing exposure to methylmercury is particularly important for pregnant women, women who are planning to become pregnant, nursing women and young children. These people should limit their consumption of all fish with much lower mercury levels than 1 ppm Hg (see above). The guideline for them is 12 ounces per week (about 3 to 4 servings). Other people can eat 14 ounces a week of fish with mercury levels that average 0.5 ppm.

* ND – mercury concentration below the Level of Detection (LOD=0.01ppm)

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• the table is formatted here: -thricemom- ♀ (63 bytes) () 11/04/2009 postreply 08:17:42

• Thank you very much! -xiongdayi- ♀ (0 bytes) () 11/04/2009 postreply 09:43:03