Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle D'Aosta, Via Bologna 148, 10154 Torino, Italy.
Chemosphere. 2013 Jan;90(2):358-65. doi: 10.1016/j.chemosphere.2012.07.028. Epub 2012 Aug 15.
The accumulation of heavy metals in freshwaters has direct consequences to man and ecosystem. Thus, in this study, the concentrations of mercury, cadmium, lead, arsenic and chromium in organs of the predator European catfish (Silurus glanis) were investigated. Samples were collected annually in five sites covering the area of the Po River (North Italy) between 2007 and 2009. Metals were differently distributed in the various organs, the highest concentrations of Hg were found in muscle and liver, Cd in kidney, Pb in gill and liver, as in muscle, and of Cr in gill and liver. Our survey found Hg exceeding the Maximum Levels (MLs) of 0.5 ppm in 18% of samples, while Pb and Cd were lower than the MLs set by European regulations in muscle tissues (1881/2006/EC and 629/2008/EC). Hg concentrations were significantly related to sampling stations studied, according to the presence of many industrial activities in the catchment area of Bormida and Tanaro Rivers. The finding that Hg did not fit food fish legislation limits indicated that S. glanis flesh might not be utilised for human consumption. A close monitoring of metals pollution is strongly recommended especially in piscivorous fish, cause their bioaccumulation capacity.
淡水重金属的积累对人类和生态系统有直接影响。因此，在这项研究中，我们调查了欧洲鲶鱼（Silurus glanis）各器官中汞、镉、铅、砷和铬的浓度。样本于 2007 年至 2009 年在波河（意大利北部）地区的五个地点每年采集一次。金属在不同的器官中分布不同，肌肉和肝脏中汞的浓度最高，肾脏中镉的浓度最高，鳃和肝脏中铅的浓度最高，肌肉中也有铅，而鳃和肝脏中铬的浓度最高。我们的调查发现，18%的样本中汞超过了 0.5ppm 的最大限量（MLs），而肌肉组织中的铅和镉低于欧洲法规规定的 MLs（1881/2006/EC 和 629/2008/EC）。根据博尔米达河和塔兰罗河集水区存在许多工业活动，发现汞的浓度与研究的采样站显著相关。汞不符合食用鱼法规限制的发现表明，S. glanis 的肉可能不适合人类食用。强烈建议对金属污染进行密切监测，特别是在食鱼性鱼类中，因为它们具有生物累积能力。
