Laboratório de Biogeoquímica Ambiental, Universidade Federal de Rondônia, Brazil.
Faculdade de Ciências da Saúde, Universidade de Brasília, Brazil.
Ecotoxicol Environ Saf. 2015 Aug;118:90-97. doi: 10.1016/j.ecoenv.2015.04.015. Epub 2015 Apr 24.
The central nervous system is a critical target for Hg toxicity in all living organisms. Total Hg (THg) was determined in brain and muscle samples of 165 specimens of eight species of catfish (Brachyplatystoma filamentosum; Brachyplatystoma platynemum; Brachyplatystoma rousseauxii; Brachyplatystoma vaillantii; Phractocephalus hemiliopterus; Pseudoplatystoma punctifer; Pseudoplatystoma tigrinum; Zungaro zungaro) from the Madeira River, Brazilian Amazon. Despite the narrow range of Fishbase trophic level (4.2-4.6) the median THg concentrations ranged from 0.39 to 1.99mg/kg and from 0.03 to 0.29mg/kg respectively in muscle and brain from the studied species. Overall, the median concentration for all samples analyzed was 0.93mg/kg and 0.16mg/kg respectively in muscle and brain; most samples (76%) showed muscle Hg concentrations >0.5mg/kg. There were statistically significant THg differences between sex (female>males). The correlation between THg concentrations in muscle and brain was statistically significant (r=0.9170; p<0.0001). In the studied specimens, fish total length was significantly correlated with muscle (r=0.3163; p=0.0001) and brain (r=0.3039; p=0.0003) THg; however, fish age was negatively and significantly correlated (r=-0.2991; p=0.0012) with THg in muscle but not with THg in brain (r=-0.0190; p=0.8492). Amazonian catfish accumulate high levels of Hg in muscle and brain; however, brain-THg concentrations can be predicted from muscle-THg. Muscle-Hg in catfish can be a tool to detect brain-Hg concentrations associated with environmental Hg.
中枢神经系统是所有生物体中汞毒性的关键靶标。在巴西亚马逊地区的马德拉河中，从 8 种鲶鱼（Brachyplatystoma filamentosum; Brachyplatystoma platynemum; Brachyplatystoma rousseauxii; Brachyplatystoma vaillantii; Phractocephalus hemiliopterus; Pseudoplatystoma punctifer; Pseudoplatystoma tigrinum; Zungaro zungaro）的 165 个样本的脑和肌肉样本中测定了总汞（THg）。尽管 Fishbase 营养水平（4.2-4.6）范围狭窄，但在所研究的物种中，肌肉和大脑中的 THg 浓度中位数分别为 0.39 至 1.99mg/kg 和 0.03 至 0.29mg/kg。总体而言，所有分析样本的中位数浓度分别为肌肉和大脑中的 0.93mg/kg 和 0.16mg/kg；大多数样本（76％）的肌肉汞浓度> 0.5mg/kg。在肌肉和大脑中，THg 浓度存在统计学上的性别差异（女性>男性）。肌肉和大脑中 THg 浓度之间存在统计学上的显著相关性（r=0.9170；p<0.0001）。在所研究的标本中，鱼的全长与肌肉（r=0.3163；p=0.0001）和大脑（r=0.3039；p=0.0003）中的 THg 显著相关；然而，鱼的年龄与肌肉中的 THg 呈负相关（r=-0.2991；p=0.0012），但与大脑中的 THg 无相关性（r=-0.0190；p=0.8492）。亚马逊鲶鱼在肌肉和大脑中积累了高水平的汞；然而，大脑中的 THg 浓度可以从肌肉中的 THg 预测。鲶鱼的肌肉中的汞可以作为检测与环境汞相关的大脑汞浓度的工具。
