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Article

Chronic Toxic Effects of Waterborne Mercury on Silver Carp (Hypophthalmichthys molitrix) Larvae

by 1,†, 2,†, 2, 2, 1,* and 2,*
1
Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou 434025, China
2
Marine College, Shandong University, Weihai 264209, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Ken Oakes
Water 2022, 14(11), 1774; https://doi.org/10.3390/w14111774
Received: 1 April 2022 / Revised: 10 May 2022 / Accepted: 27 May 2022 / Published: 31 May 2022
Mercury (Hg) is a kind of heavy metal pollutant widely existing in the aquatic environment, and it is also recognized to have a highly toxic effect on fish. In this study, silver carp (Hypophthalmichthys molitrix) larvae were exposed to 0 (control), 1, 5, and 10 μg/L Hg2+ for 2 weeks. Antioxidant ability, neurotoxicity, and thyroid hormones (THs) content were evaluated. In comparison with the control, the superoxide dismutase (SOD) activity and the glutathione (GSH) activity were lower in silver carp exposed to 10 μg/L Hg2+. The lowest catalase (CAT) activity was found in the 10 μg/L Hg2+, while malondialdehyde (MDA) content was not significantly different among all groups. Compared with the control, monoamine oxidase (MAO) activity and nitric oxide (NO) content were significantly higher in the 10 μg/L Hg2+, while acetylcholinesterase (AChE) activity significantly decreased. Compared with the control, triiodothyronine (T3) content was significantly higher in the 1 μg/L Hg2+ and significantly lower in the 10 μg/L Hg2+; the 1 μg/L and 5 μg/L Hg2+ groups had significantly higher thyroxine (T4) content than the other groups. In the 1 μg/L Hg2+, the integrated biomarker response (IBR) index value was the highest. In summary, exposure to Hg could decrease the antioxidant ability, cause changes in neurotoxic parameters, and induce disorders of the thyroid hormone system in silver carp larvae. The results of this study may contribute to the understanding of the adverse effects of chronic mercury poisoning on fish. View Full-Text
Keywords: Hypophthalmichthys molitrix; mercury; biochemical responses; thyroid hormones; IBR Hypophthalmichthys molitrix; mercury; biochemical responses; thyroid hormones; IBR
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MDPI and ACS Style

Wang, Y.-J.; Chen, C.-Z.; Li, P.; Liu, L.; Chai, Y.; Li, Z.-H. Chronic Toxic Effects of Waterborne Mercury on Silver Carp (Hypophthalmichthys molitrix) Larvae. Water 2022, 14, 1774. https://doi.org/10.3390/w14111774

AMA Style

Wang Y-J, Chen C-Z, Li P, Liu L, Chai Y, Li Z-H. Chronic Toxic Effects of Waterborne Mercury on Silver Carp (Hypophthalmichthys molitrix) Larvae. Water. 2022; 14(11):1774. https://doi.org/10.3390/w14111774

Chicago/Turabian Style

Wang, Ya-Jun, Cheng-Zhuang Chen, Ping Li, Ling Liu, Yi Chai, and Zhi-Hua Li. 2022. "Chronic Toxic Effects of Waterborne Mercury on Silver Carp (Hypophthalmichthys molitrix) Larvae" Water 14, no. 11: 1774. https://doi.org/10.3390/w14111774

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