what fish have the lowest... and highest content of mercury?

Answer 1

The lowest is the ones that dont feed on other fish and are small like prawns crabs sardines etc, shark swordfish and even tuna have more because they are bigger older and some feed on other large fish it is recommended that you only have shark and swordfish once a week if that especially if pregnant.
Mercury also if found in amalgam fillings.

Answer 2

Pink Salmon has a pretty high mercury content because the water it spawns in is polluted with high levels of mercury.

Answer 3

Search on Google :'Mercury levels in fish' and it gives you a table with them all in.

Answer 4

A stright to the point answer World be “sword fish and shark”.

Recent studies show that artificially raised fish, grown in tanks, will contain slight higher levels of certain elements, including mercury.

Mercury occurs naturally in the environment. According to FDA toxicologist Mike Bolger, Ph.D., approximately 2,700 to 6,000 tons of mercury are released annually into the atmosphere naturally by degassing from the Earth's crust and oceans. Another 2,000 to 3,000 tons are released annually into the atmosphere by human activities, primarily from burning household and industrial wastes, and especially from fossil fuels such as coal.
Mercury vapor is easily transported in the atmosphere, deposited on land and water, and then, in part, released again to the atmosphere. trace amounts of mercury are soluble in bodies of water, where bacteria can cause chemical changes that transform mercury to methyl mercury, a more toxic form.
Fish absorb methyl mercury from water as it passes over their gills and as they feed on aquatic organisms. Larger predator fish are exposed to higher levels of methyl mercury from their prey.
Methyl mercury binds tightly to the proteins in fish tissue, including muscle. Cooking does not appreciably reduce the methyl mercury content of the fish.
Nearly all fish contain trace amounts of methyl mercury, some more than others. In areas where there is industrial mercury pollution, the levels in the fish can be quite elevated. In general, however, methyl mercury levels for most fish range from less than 0.01 ppm to 0.5 ppm. It's only in a few species of fish that methyl mercury levels reach FDA limit for human consumption of 1 ppm. This most frequently occurs in some large predator fish, such as shark and swordfish. Certain species of very large tuna, typically sold as fresh steaks or sushi, can have levels over 1 ppm. (Canned tuna, composed of smaller species of tuna such as skipjack and albacore, has much lower levels of methyl mercury, averaging only about 0.17 ppm.) The average concentration of methyl mercury for commercially important species (mostly marine in origin) is less than 0.3 ppm.
Results of FDA surveillance sampling for methyl mercury in fish from October 1992 through September 1994 are shown below. At least five samples of each species were analyzed. If a species was sampled in both fiscal years, only the FY 1994 results are shown. The limit of quantifiable detection is 0.10 part per million (ppm); therefore, any values less than 0.10 ppm are shown as ND (not detected). FDA's action level is 1 ppm.
Results describe classifies as Species, Range (ppm), Average (ppm)
Catfish: ND - 0.16 ND
Cod: ND-0.17; 0.13
Crab: ND-0.27; 0.13
Flounder: ND; ND
Hake: ND; ND
Halibut: 0.12 - 0.63; 0.24
Pollock: ND; ND
Salmon (canned): ND; ND
Salmon (Fresh or frozen): ND; ND
Shark: 0.30 - 3.52; 0.84
Swordfish: 0.36 - 1.68; 0.88
Tuna (canned); ND - 0.34; 0.20