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Mercury levels in commercial fish and shellfish

Species	Mercury concentration (ppm; mean)	Number of samples
Fish and shellfish with highest levels of mercury
King mackerel	0.730	213
Shark	0.988	351
Swordfish	0.976	618
Tilefish (Gulf of Mexico)	1.450	60
Fish and shellfish with lower levels of mercury^¶
Anchovies	0.043	40
Butterfish	0.058	89
Catfish	0.049	23
Clam*	ND	6
Cod	0.095	39
Crab^Δ	0.060	63
Crawfish	0.033	44
Croaker (Atlantic)	0.072	35
Flatfish*^◊	0.045	23
Haddock (Atlantic)	0.031	4
Hake	0.014	9
Herring	0.044	38
Jacksmelt	0.108	16
Lobster (spiny)	0.09	9
Mackerel (North Atlantic)	0.050	80
Mackerel (chub, Pacific)	0.088	30
Mullet	0.046	191
Oyster	0.013	38
Perch (ocean)*	ND	6
Pollock	0.041	62
Salmon (canned)*	ND	23
Salmon (fresh/frozen)*	0.014	34
Sardine	0.016	29
Scallop	0.050	66
Shad (American)	0.065	59
Shrimp*	ND	24
Squid	0.070	200
Tilapia*	0.010	9
Trout (freshwater)	0.072	34
Tuna (canned, light)	0.118	347
Whitefish	0.069	28
Whiting	ND	2
Mercury levels of other fish and shellfish^¶
Bass (saltwater, black, striped)^§	0.219	47
Bass (Chilean)	0.386	40
Bluefish	0.337	52
Buffalofish	0.19	4
Carp	0.14	2
Croaker (white, Pacific)	0.287	15
Grouper (all species)	0.465	43
Halibut	0.252	46
Lobster (Northern/American)	0.310	88
Lobster (species unknown)	0.169	16
Mackerel (Spanish, Gulf of Mexico)	0.454	66
Mackerel (Spanish, South Atlantic)	0.182	43
Marlin*	0.485	16
Monkfish	0.180	81
Orange roughy	0.554	49
Perch (freshwater)	0.14	5
Sablefish	0.220	102
Scorpionfish	0.286	78
Sheepshead	0.128	59
Skate	0.137	56
Snapper	0.189	43
Tilefish (Atlantic)	0.144	32
Tuna (canned, albacore)	0.353	399
Tuna (fresh/frozen, all)	0.383	228
Tuna (fresh/frozen, albacore)	0.357	26
Tuna (fresh/frozen, bigeye)	0.639	13
Tuna (fresh/frozen, skipjack)	0.205	2
Tuna (fresh/frozen, yellowfin)	0.325	87
Tuna (fresh/frozen, species unknown)	0.414	100
Weakfish (sea trout)	0.256	39

Mercury was measured as total mercury, except for species (*) in which only methylmercury was analyzed.
Source of data: FDA 1990 to 2004, "National Marine Fisheries Service Survey of Trace Elements in the Fishery Resource" Report 1978, "The Occurrence of Mercury in the Fishery Resources of the Gulf of Mexico" Report 2000.

ppm: parts per million; ND: not determinable, since mercury concentration was below the detection level (<0.01 ppm).
¶ The following species have been removed from the tables: Bass (freshwater) - not commercial; Pickerel - not commercial.
Δ Includes blue, king, snow.
◊ Includes flounder, plaice, sole.
§ Includes sea bass/striped bass/rockfish.

Data from: Mercury levels in commercial fish and Shellfish. US Food and Drug Administration. Available at http://www.fda.gov/Food/FoodSafety/Product-SpecificInformation/Seafood/FoodbornePathogensContaminants/Methylmercury/ucm115644.htm. Accessed 1/26/2010.

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