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。
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。
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。
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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