When buying tuna, opt for skipjack or canned light varieties, which do not harbor as much mercury as albacore or bigeye. You can consume skipjack and canned light tuna alongside other low-mercury species, such as cod, crab, salmon and scallops, as part of the recommended 2–3 servings of fish per week ( 10 ).
Safe Catch Elite Tuna, simply the lowest mercury tuna of any brand.
Canned light tuna is the better, lower-mercury choice, according to the FDA and EPA. Canned white and yellowfin tuna are higher in mercury, but still okay to eat. Bigeye tuna should be avoided completely, but that species isn't used for canned tuna anyway.
Five of the most commonly eaten fish that are low in mercury are shrimp, canned light tuna, salmon, pollock, and catfish. Another commonly eaten fish, albacore ("white") tuna has more mercury than canned light tuna.
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.
Best in breed
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.
Interesting to know: all the pole and line products (except Woolworths') are skipjack tuna, which is significantly lower in mercury than yellowfin (which Sirena is full of).
Canned light tuna is in the “Best Choices” category and it is fine to eat 2 to 3 servings per week. We recommend that you eat a variety of fish.
Yellowfin and albacore tuna land somewhere in between, containing around 30 micrograms of mercury per 3 ounces. Given these mercury concentrations, people may safely consume three to four servings of low-mercury tuna per week. Higher mercury tuna should be restricted to one serving per week.
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).
Cooking does not remove mercury from fish because the metal is bound to the meat. For example, a piece of tuna will have the same amount of mercury whether it is eaten raw as sushi or cooked on the grill.
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.
Two familiar US brands, StarKist and Chicken of the Sea, accounted for 60 percent of our light tuna samples. The overall average mercury levels in the two brands were 0.131 and 0.126 µg/g, respectively, and one set of samples of each brand had much higher than aver- age levels.
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.
Interestingly, although tuna is a large predatory fish it generally has mercury levels <0.5 mg/kg.
Cooking is known to reduce mercury content in fish by up to 30 percent. Additionally, the half-life of methylmercury is only two months for human beings and less for other species, so large intake of those species in the past isn't necessarily an irreversible problem.
Most of the metallic mercury will accumulate in your kidneys, but some metallic mercury can also accumulate in the brain. Most of the metallic mercury absorbed into the body eventually leaves in the urine and feces, while smaller amounts leave the body in the exhaled breath.
Is canned tuna safe to eat regularly? Yes. In general, it is safe for all population groups, including pregnant women, to consume 2-3 serves of any type of tuna per week (canned or fresh).
The benefits of eating canned tuna every day outweigh the risks. Because canned tuna provides omega-3 fatty acids and is a lean source of protein, there's no harm in adding it to your daily diet.
The most commonly accepted methods of assessing mercury exposure are to test urine or blood. Both tests usually measure levels of total mercury (elemental, inorganic and organic). Elevated mercury in urine usually indicates exposure to an elemental or inorganic source of mercury, such as from a job that uses mercury.
Sirena Tuna is made with only the highest quality ingredients, including our premium oil blends and high specification tuna. Our commitment to sustainability is paramount to our business: 100% of our tuna is pole and line caught.
Over the past 60 years, Sirena's iconic yellow cans and mermaid logo have become synonymous with quality and amazing taste. The secret lies in Sirena's choice of the finest oil blends and flavoursome tuna loins from freshly caught yellowfin and skipjack tuna. Today, quality and sustainability go hand in hand at Sirena.
It is safe for everyone (including pregnant women) to consume canned tuna as part of their fish intake. Canned tuna generally has lower levels of mercury than tuna fillets because smaller tuna species are used and the tuna are generally younger when caught.