Branco Vasco, Vale Carlos, Canário João, Santos Miguel Neves Dos
National Institute for Agronomy and Fisheries Research (INIAP/IPIMAR), Avenida de Brasília, 1449-006 Lisboa, Portugal.
Environ Pollut. 2007 Dec;150(3):373-80. doi: 10.1016/j.envpol.2007.01.040. Epub 2007 Mar 21.
Muscle, liver and stomach contents of 64 blue sharks and 52 swordfishes, caught between September 2004 and February 2005 near the Azores (area A) and the Equator (area E), were analysed for mercury and selenium. Levels of mercury were relatively high (blue shark: 0.032-2.5microgg(-1); swordfish: 0.031-9.8microgg(-1)) and comparable to values reported in the literature. However, mercury and organic mercury concentrations in muscle and liver of specimens from E were significantly higher than those from A. A similar trend was registered in stomach contents, suggesting higher uptake of Hg in specimens from E. This difference was also observed in the relationship between concentration in muscle and size, indicating a higher accumulation rate in specimens from E. The accumulation of Se in the liver of both species showed a positive correlation with inorganic mercury concentrations, pointing to a detoxifying mechanism of organic mercury in these species through Se-Hg liasons.
对2004年9月至2005年2月间在亚速尔群岛附近（A区域）和赤道附近（E区域）捕获的64条蓝鲨和52条剑鱼的肌肉、肝脏和胃内容物进行了汞和硒含量分析。汞含量相对较高（蓝鲨：0.032 - 2.5微克/克；剑鱼：0.031 - 9.8微克/克），与文献报道的值相当。然而，来自E区域的样本肌肉和肝脏中的汞及有机汞浓度显著高于来自A区域的样本。胃内容物中也呈现出类似趋势，表明来自E区域的样本对汞的摄入量更高。在肌肉浓度与大小的关系中也观察到了这种差异，表明来自E区域的样本积累速率更高。两种鱼类肝脏中硒的积累与无机汞浓度呈正相关，表明这些物种中有机汞通过硒 - 汞键合存在解毒机制。
