It's generally safe for all population groups, including pregnant women, to consume 2-3 serves of any type of tuna or salmon a week, canned or fresh. Canned tuna usually has lower mercury levels than other tuna because tuna used for canning are smaller species that are caught when less than 1 year old.
Best in breed
Think twice about yellowfin, which is generally less sustainable than skipjack. If the tin doesn't list the type of tuna, don't buy it. Brands with decent credentials include Fish 4 Eva, John West, Safcol and Sirena. Aldi and Coles own-brand cans are OK, too, but check each for breed and catch method.
In most fish, the levels are very low. However, some varieties contain high levels of mercury due to their feeding habits or surrounding environment. Commercially sold fish that may contain high levels of mercury include shark (flake), ray, swordfish, barramundi, gemfish, orange roughy, ling and southern bluefin tuna.
While mercury levels in our test were higher in albacore than in light tunas, some brands had a much larger variation than others. For example, Chicken of the Sea's albacore had 10 times more mercury than its light tuna, but mercury levels in Wild Planet's albacore and skipjack tunas were very close to each other.
Skipjack are the smallest of the major tuna species, while yellowfin are larger. So, the fact the canned tuna in Australian cupboards is likely to contain smaller species is already a bonus when it comes to reducing mercury risk.
If you're concerned about limiting the amount of mercury you consume, and if you've eaten no other fish during the week, Consumer Reports says up to 12 ounces a week of Bumble Bee Chunk Light, Chicken of the Sea Chunk Light, Safe Catch Wild Elite, and StarKist Chunk Light tunas are the safer choices among the products ...
Takeaway. Certain types of tuna are high in mercury, which can have harmful effects on health in high amounts or in certain populations. For most healthy adults, it's recommended to consume at least 2 servings of fish per week, which can include tuna.
"While canned tuna, especially light varieties, has relatively low average levels of mercury, individual cans can sometimes have much higher levels," Consumer Reports said.
Canned white, or albacore (0.32 parts per million of mercury). Children under six can eat up to one 3-ounce portion a month; children from 6-12, two 4.5-ounce portions a month. Adults, including pregnant women, can safely eat this kind of tuna up to three times a month (women, 6-ounce portions; men, 8-ounce portions).
Yes. Swordfish is a good source of omega-3 fatty acids, but several other fish lower in mercury are too. This includes mackerel, warehou (trevally), Atlantic salmon, canned salmon and tuna, herrings and sardines.
Wild-caught and farm-raised Barramundi contain different mercury levels due to their very different diets. Methylmercury is primarily a concern in large predatory fish that consume other fish, so large wild-caught barramundi have a higher risk of containing mercury than our farmed barramundi.
FSANZ has calculated that it is safe for all population groups to consume a snack can of tuna (95 grams) everyday, assuming no other fish is eaten. But remember, the Australian Dietary Guidelines recommend that a variety of foods be consumed. 6.
SAFCOL TUNA
The South Australian Fishermans Co-Operative Limited (S.A.F.C.O.L.) was founded in 1945 by a group of South Australian Fishermen to sell their catch; the first of its kind in Australia.
The most common canned tuna is skipjack tuna or sometimes yellowfin tuna wild caught in the Pacific Ocean. They are highly migratory, travel long distances and may be caught in international waters fished by many different countries so it is not practicable to specify country of origin.
Mercury accumulates in your bloodstream over time and slowly leaves the body through urine, feces, and breast milk. If you eat a lot of fish high in mercury, it may take up to a year for your mercury levels to drop after you stop eating the fish.
Can cooking fish get rid of the mercury? No, there is no method of cooking or cleaning fish that will reduce the amount of mercury. Pregnant women should enjoy cooked fish and not eat raw fish as raw fish may have bacteria that can harm your baby.
They recommend that people who are not pregnant eat no more than one to two cans of albacore per week, depending on brand, but that up to three cans per week of most brands of chunk light tuna are fine. Chicken of the Sea, Safe Catch, and Starkist brands showed lower levels of mercury in their tests.
Salmon is low in mercury.
Both wild and farmed Atlantic salmon have much lower mercury levels than most other fish species. Farmed salmon has on average, 0.05 micrograms of mercury per gram.
According to the Food and Drug Administration, salmon's average mercury concentration is 0.022 parts per million (ppm). Tuna has a higher average concentration of 0.144 ppm. Health experts recommend eating about 8 ounces of seafood per week. You could easily overdo it if your daily lunch is a good ol' can of tuna.
Health effects of mercury exposure
The inhalation of mercury vapour can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. The inorganic salts of mercury are corrosive to the skin, eyes and gastrointestinal tract, and may induce kidney toxicity if ingested.
If you're counting calories and maximizing omega-3 fatty acids, then tuna in water might make a great choice. On the other hand, if moisture, flavor, and vitamin D levels are your focus, then olive oil-packed tuna might be better. Whatever tuna you choose, it's important not to go overboard for this mild-flavored fish.