The mercurylevel in fish depends on its species, age, foraging mode and habitat.
鱼类中的水银含量，视乎其品种、年龄、觅食模式和生活水域而定。
2
Of that group, 63 people had blood mercury levels more than twice the recommended level and 19 showed blood mercury levels four times the level considered safe.
在这一组人中，63人血液中汞含量是建议值的两倍以上，而且有19人血液中汞含量是认可安全值的4倍。
3
The women who gave birth more than two weeks early were three times as likely to have double the average mercurylevel in their hair samples, the researchers said.