Acute Toxicity of Divalent Mercury Ion to Anguilla japonica from Seawater and Freshwater Aquaculture and Its Effects on Tissue Structure

Yuanqiang Tang, Yunguo Liu, Tao Zhang, Jiang Li, Xiaohua Wang, Wei Zhang, Guangming Zeng, Shaobo Liu and Lei Guan
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Yuanqiang Tang: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Yunguo Liu: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Tao Zhang: Meijiang County Aquatic Technology Promotion Station, Meizhou 514000, China
Jiang Li: School of Architecture and Art, Central South University, Changsha 410082, China
Xiaohua Wang: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Wei Zhang: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Guangming Zeng: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Shaobo Liu: School of Architecture and Art, Central South University, Changsha 410082, China
Lei Guan: Meizhou Fisheries Research Institute, Meizhou 514000, China

IJERPH, 2019, vol. 16, issue 11, 1-12

Abstract: The acute toxicity of divalent mercury ion to Anguilla japonica 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 50 ) 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.

Keywords: mercury; Anguilla japonica; acute toxic effects; safety concentration (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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