Laboratório de Biogeoquímica Costeira, Instituto de Ciências do Mar, Av. Abolição 3207, Fortaleza, CE, 60165-081, Brazil,
Bull Environ Contam Toxicol. 2014 Jul;93(1):31-5. doi: 10.1007/s00128-014-1263-0. Epub 2014 Apr 12.
Indigenous, introduced and farmed fish species were collected from the Jaguaribe Basin, NE Brazil to assess total and methyl mercury concentrations in muscle tissue and to determine its relationship with fish origin. The results obtained from introduced species were compared to the Hg content of their original area of occurrence, which is located in the Amazon region. Farmed and wild individuals of Oreochromis niloticus (tilapia) were also compared. Introduced species presented lower Hg contents compared to their Amazonian counterparts. Wild individuals of O. niloticus also presented higher Hg contents than farmed individuals with similar sizes. However, methyl Hg concentrations were not significantly different between the two groups. Total Hg and methyl Hg concentrations were higher in carnivorous species, especially those from the Amazon region, and surpassed the Brazilian guidelines for fish consumption. Based on their Hg content, Jaguaribe basin fish do not pose a significant threat to human consumption.
从巴西东北部的 Jaguaribe 流域采集了本地种、引入种和养殖种鱼类，以评估肌肉组织中的总汞和甲基汞浓度，并确定其与鱼类起源的关系。将引入种的结果与它们在亚马逊地区的原始分布区的汞含量进行了比较。还比较了养殖和野生的尼罗罗非鱼（罗非鱼）个体。与亚马逊地区的相应种相比，引入种的汞含量较低。体型相似的野生尼罗罗非鱼个体的汞含量也高于养殖个体。然而，两组之间的甲基汞浓度没有显著差异。总汞和甲基汞浓度在肉食性鱼类中较高，特别是来自亚马逊地区的鱼类，超过了巴西鱼类消费指南的标准。根据它们的汞含量，Jaguaribe 流域的鱼类对人类食用没有重大威胁。
