The increasing contamination of water bodies with mercury (Hg) raises concerns about the possible effects of this metal on native fish species. Our current understanding of its dynamics in fish organs remains limited. In this study, adult individuals of the native species Astyanax eigenmanniorum were exposed to three environmentally relevant HgCl₂ concentrations (5, 100, and 170 μg L⁻¹) for 96 h. To evaluate total Hg (THg) elimination, new individuals were exposed to 100 μg L⁻¹ of HgCl₂ (96 h), and at the end of the exposure period, half of the fish were placed in tanks with clean water for 168 h. In both assays, the organs were removed, and THg levels were measured using ICP-MS. The uptake of IHg in A. eigenmanniorum showed a differential accumulation in the organs. Gills, intestine, and brain were the tissues with the highest THg levels. Finally, no elimination of THg in the water was observed, but intestine and gills significantly removed the THg accumulated. Probably a Hg redistribution through the tissues could take place.

水体中汞（Hg）污染的日益增加，引起人们对该金属对本地鱼类的可能影响的关注。我们目前对其在鱼类器官中的动力学的了解仍然有限。在这项研究中，本地物种Astyanax eigenmanniorum的成年个体暴露于三种与环境相关的HgCl ₂浓度（5、100和170μgL ^-1）96小时。为了评估总Hg（THg）消除，将新个体暴露于100μgL ^-1的HgCl ₂（96 h）中，并且在暴露时间结束时，将一半的鱼放在装有清水的水箱中168 h 。在这两种测定中，均去除了器官，并使用ICP-MS测定了THg水平。吸收IHg本征曲霉在器官中显示出不同的积累。g，肠和脑是THg含量最高的组织。最后，没有观察到水中THg的消除，但是肠和g显着地除去了积累的THg。汞可能会通过组织重新分布。