Journal
WATER
Volume 14, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/w14111774
Keywords
Hypophthalmichthys molitrix; mercury; biochemical responses; thyroid hormones; IBR
Categories
Funding
- Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education (Yangtze University) [KFT202006]
- National Key Research and Development Program of China [2018YFD0900902, 2018YFD0900905]
Ask authors/readers for more resources
This study found that exposure to Hg can decrease the antioxidant ability, cause changes in neurotoxic parameters, and induce disorders of the thyroid hormone system in silver carp larvae.
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 mu g/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 mu g/L Hg2+. The lowest catalase (CAT) activity was found in the 10 mu g/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 mu g/L Hg2+, while acetylcholinesterase (AChE) activity significantly decreased. Compared with the control, triiodothyronine (T3) content was significantly higher in the 1 mu g/L Hg2+ and significantly lower in the 10 mu g/L Hg2+; the 1 mu g/L and 5 mu g/L Hg2+ groups had significantly higher thyroxine (T4) content than the other groups. In the 1 mu g/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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available