Mercury levels are high in marine fish, too—particularly in larger species, such as shark, tuna, and swordfish.

海洋鱼类中的汞含量也很高——尤其在体型较大的鱼类体内，如鲨鱼、金枪鱼和旗鱼。

youdao

youdao

youdao

The proposal would declare bluefin tuna so endangered that a ban on international trade in the fish is required.

VOA: standard.2010.03.04

Half our coral reefs are dead or dying. We've lost 90 percent of deep blue water,big game fish: the halibut,the tuna and the marlin that we all loved to eat.

VOA: standard.2010.08.04

As Bill Brown and his crew tied down his 50-foot boat, the Jamie B, he said his biggest concern was losing work days to fish tuna.

WSJ: Irene Closes In on North Carolina Coast

The menu items were the same for each participant, Dr. Bray said, but a participant on the low-protein diet would have gotten more mayonnaise and less tuna in a tuna fish salad, while the high-protein diet was extra tuna with little mayonnaise.

WSJ: New Ways Calories Can Add Up to Weight Gain

In fact large fish like sharks, tuna and swordfish feed on smaller fish and can accumulate high levels of environmental pollutants like mercury.

CNN: Beware of shark meat, FDA warns