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.

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。

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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.

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。

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Heavy metal ions in water can be concentrated in aquatic organisms, which may threaten human health through the food chain.

水体中的重金属离子可以在水生生物中富集，通过食物链危害人体健康。

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Bighead and silver carp gobble enormous volumes of plankton, a crucial link in the aquatic food chain, while silver carp sometimes collide with boaters by hurtling from the water when startled.

WSJ: Asian carp spawning areas wider than expected