水生食物链不同于陆地食物链。
大型食肉鱼类-如方头鱼，旗鱼和鲭鱼的甲基汞水平往往高于比他们更小的鱼，因为其水生食物链中更高。
Large, predatory fish - such as tilefish, swordfish and king mackerel - tend to have higher levels of methyl mercury than do smaller fish because they're higher in the aquatic food chain.
他们的体重最大可以到100磅，4英尺长，每天吃掉的浮游生物重达自身体重的百分之40。浮游生物是水生食物链的基础。
The biggest can reach 100 pounds and 4 feet long, consuming up to 40 percent of their body weight daily in plankton, the base of the aquatic food chain.
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