College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China.
Int J Environ Res Public Health. 2019 Jun 3;16(11):1965. doi: 10.3390/ijerph16111965.
The acute toxicity of divalent mercury ion to from seawater and freshwater aquaculture was assessed. In particular, the effects of toxicity on the microstructures of the gill and liver tissues were examined using the hydrostatic method, without feeding, at a water temperature of 20 °C. The median lethal concentrations (LC) of divalent mercury ion to fishes in seawater and freshwater over various durations were: 24 h = 1.637 and 1.428 mg/L; 48 h = 1.562 and 1.377 mg/L; 72 h = 1.530 and 1.284 mg/L; and 96 h = 1.442 and 1.228 mg/L. The safety mass concentrations were 0.1442 and 0.01228 mg/L, respectively. After exposure to divalent mercury ion, adhesion between the gill lamellae and massive cellular disintegration and necrotic shedding were observed in the gill tissue sections. The liver tissues underwent hyperemia and swelling, with the appearance of blood spots, swelling of the hepatocyte mitochondria, dilation of the rough endoplasmic reticulum, and intercellular inflation.
采用静水式生物毒性试验方法，在水温为 20°C、不投饵的条件下，评估了二价汞离子对海水和淡水养殖鱼类的急性毒性。结果表明，二价汞离子对海水鱼类和淡水鱼类的 24 h、48 h、72 h 和 96 h 的半数致死浓度（LC）分别为：1.637 和 1.428 mg/L、1.562 和 1.377 mg/L、1.530 和 1.284 mg/L、1.442 和 1.228 mg/L；安全质量浓度分别为 0.1442 和 0.01228 mg/L。暴露于二价汞离子后，鱼类鳃组织切片中观察到鳃小片的黏连以及大量细胞的崩解和坏死脱落；肝脏组织出现淤血和肿胀，出现血斑，肝细胞线粒体肿胀，粗面内质网扩张，细胞间水肿。
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