IPIMAR - National Institute of Biological Resources, Av. Brasília, 1449-006 Lisbon, Portugal.
Mar Pollut Bull. 2011 Dec;62(12):2854-8. doi: 10.1016/j.marpolbul.2011.09.020. Epub 2011 Oct 8.
Concentrations of Zn, Cd and Pb were measured in muscle of pelagic, demersal and benthic fishes, captured in the coastal area adjoining the Tagus estuary (Portugal), in 1998 and 2010. Additionally, Pb and Cd were determined in estuarine waters, showing a pronounced decrease between 1999 and 2010. Accordingly, specimens captured in 2010 presented significantly lower metal concentrations than individuals caught in 1998. Reductions were more evident for Pb (reduction of 59-99%) than for Cd (14-93%) and Zn (17-54%). Values in pelagic and demersal species exhibited higher reductions than in benthic species. Decrease of metal concentrations in fish appears thus to reflect the improvement of estuarine water quality as anthropogenic sources have been reduced or eliminated. Furthermore, it emphasises the usefulness of the descriptor "Contaminants in Fish" to assess the efficiency of measures to achieve a good environmental status, in the scope of the Marine Strategy Framework Directive.
1998 年和 2010 年，在毗邻葡萄牙塔古斯河口的沿海地区捕获的远洋、近岸和底栖鱼类的肌肉中测量了锌、镉和铅的浓度。此外，还测定了河口水中的铅和镉含量，结果表明 1999 年至 2010 年间含量明显下降。因此，2010 年捕获的标本的金属浓度明显低于 1998 年捕获的标本。铅的降幅更为显著（59-99%），镉的降幅为 14-93%，锌的降幅为 17-54%。远洋和近岸物种的浓度降幅大于底栖物种。鱼类体内金属浓度的降低反映了河口水质的改善，因为人为污染源已经减少或消除。此外，这强调了“鱼类污染物”这一描述符在评估实现良好环境状况的措施的效率方面的有用性，这是海洋战略框架指令的范围。
