Yellowfin tuna are typically smaller and harvested at a young age. Ahi tuna (yellowfin and bigeye) is high in mercury.

Bigeye tuna (N=705) Atlantic bluefin tuna* (N=1669) Blackfin tuna* (N=109) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Total M ercury (ppm , w w ) Estimated Harvest, 2016 (Million Tonnes) Figure 1.

Others can eat it sparingly. People in vulnerable groups should avoid it. The battle, raging for two years, sheds light on the unsettled and contentious issue of seafood safety, particularly for large, long-lived fish like tuna and swordfish that tend to accumulate mercury. Do not eat shark, swordfish, king mackerel, marlin, orange roughy, bigeye tuna, or tilefish from the Gulf of Mexico, because these all contain high levels of mercury. Others can eat it sparingly. Mercury accumulates more in muscle than in fatty tissue, so the leanest fish tend to have the highest concentrations.

Fish and shellfish concentrate mercury in their bodies, often in the form of methylmercury, a highly toxic organomercury compound. Mercury concentrations in Hawaiian-caught bigeye and yellowfin tuna are steadily rising and mirror increases in North Pacific waters that have been linked to atmospheric mercury …
People in vulnerable groups should avoid it. Average (± SD; N=sample size) total mercury (THg) concentration in muscle tissue of nine tuna species compared with the FAO harvest estimate in tonnes. Summary Skipjack and canned light tuna, which are relatively low in mercury, can be eaten as part of a healthy diet.

Bluefish, shark, swordfish, wild sturgeon, opah and bigeye tuna carry a proportionately large mercury burden as well.

Everyone else should try not to eat more than one or two meals per month of fish and seafood with the highest levels of mercury; that means go easy on the bigeye tuna.

Mercury concentrations in Hawaiian-caught bigeye and yellowfin tuna are steadily rising and mirror increases in North Pacific waters that have been linked to atmospheric mercury … Mercury concentrations in Hawaiian-caught bigeye and yellowfin tuna are steadily rising and mirror increases in North Pacific waters that have been linked to atmospheric mercury emissions from Asia. Researchers compiled and re-analyzed data from previously published reports on yellowfin and bigeye tuna caught near Hawaii over the past four decades, then used a mathematical model to …
But bigeye tuna has a downside: Each fish can grow to more than 400 pounds (181 kilograms), so mercury can be a concern, depending on where and how they're caught.

Bluefin and bigeye are larger fish and eat more often, which can slowly increase the level of toxins in their tissues over time. Mercury concentrations in Hawaiian-caught bigeye and yellowfin tuna are steadily rising and mirror increases in North Pacific waters that have been linked to atmospheric mercury emissions from Asia. Muscle samples of 121 and 110 bigeye tuna (Thunnus obesus) caught by Taiwanese long-line fishing vessels in the Atlantic and Indian Oceans, respectively, were used to analyze total mercury (THg) and organic mercury (OHg) content.


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