IDEA - Instituto de Diversidad y Ecología Animal (CONICET) and Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 299 (X5000JJC), Córdoba, Argentina.
CIBICI - Centro de Investigaciones en Bioquímica Clínica e Inmunología (CONICET) and Facultad de Ciencias Químicas, Universidad Nacional de Córdoba (5000), Argentina.
Aquat Toxicol. 2020 Sep;226:105567. doi: 10.1016/j.aquatox.2020.105567. Epub 2020 Jul 18.
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 HgCl concentrations (5, 100, and 170 μg L) for 96 h. To evaluate total Hg (THg) elimination, new individuals were exposed to 100 μg L of HgCl (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）的污染日益严重，引起了人们对这种金属可能对本地鱼类物种产生影响的担忧。我们目前对其在鱼类器官中的动态的理解仍然有限。在这项研究中，将成年的本地物种 Astyanax eigenmanniorum 暴露于三种与环境相关的 HgCl 浓度（5、100 和 170μg/L）下 96 小时。为了评估总汞（THg）的消除，新的个体暴露于 100μg/L 的 HgCl（96 小时）中，在暴露期结束时，将一半的鱼放入装有清洁水的水箱中 168 小时。在这两种测定中，都取出器官，并使用 ICP-MS 测量 THg 水平。IHg 在 A. eigenmanniorum 中的摄取表现出器官的差异积累。鳃、肠和脑是 THg 含量最高的组织。最后，在水中没有观察到 THg 的消除，但肠和鳃显著去除了积累的 THg。可能会发生通过组织的 Hg 再分配。
