Bioaccumulation of mercury in fishes of Jagadishpur Reservoir, Nepal

Authors

  • Prakash Acharya Faculty of Applied Ecology and Agricultural Sciences, Hedmark University of Applied Sciences, Hedmark, Norway.
  • Chhatra Mani Sharma Central Department of Environmental Science, Tribhuvan University, Kathmandu, Nepal. https://orcid.org/0000-0003-0714-7411
  • Shichang Kang State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China. https://orcid.org/0000-0003-2115-9005
  • Lekhendra Tripathee State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Himalayan Environment Research Institute (HERI), Kathmandu, Nepal. https://orcid.org/0000-0001-6210-5105
  • Junming Guo State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
  • Rukumesh Paudyal State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Himalayan Environment Research Institute (HERI), Kathmandu, Nepal. https://orcid.org/0000-0002-1141-4132
  • Qianggong Zhang Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China.
  • Hemraj Bhattarai Himalayan Environment Research Institute (HERI), Kathmandu, Nepal; Kathmandu Center for Research and Education (KCRE), Kathmandu, Nepal.
  • Mika Sillanpää Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam; Faculty of Environment and Chemical Engineering, Duy Tan University, Da Nang 550000, Vietnam; School of Civil Engineering and Surveying, Faculty of Health, Engineering and Sciences, University of Southern Queensland, West Street, Toowoomba, 4350 QLD, Australia. https://orcid.org/0000-0003-3247-5337

DOI:

https://doi.org/10.3126/njes.v7i0.34370

Keywords:

Fish diet, Stable isotopes of carbon, Stable isotopes of nitrogen, Total mercury, Trophic position

Abstract

Stable isotope ratios of nitrogen (δ15N, ‰) and carbon (δ13C, ‰), accompanied by stomach contents were used to assess the food chain and trophic transfer of mercury in fifty-three marketable sized fish belonging to five species (Channa punctatus, Mystus vittatus, Nandus nandus, Puntius sophore and Xenentodon cancila) from the Jagadishpur Reservoir, Nepal. The highest total Hg concentration was found in X. cancila with an average of 800.42(±279.36) µg/kg exceeding the international marketing limit (500 mg/kg), a carnivorous species. However, except for some individuals of N. nandus, total Hg concentrations in other fish species in the present study were significantly lower than that limit. The fish community had at least two trophic levels (Δ15N > 5.6), C. punctatus with the highest and M. vittatus the lowest signatures of δ15N, which was also supported by the stomach content analysis. There was neither correlation between total Hg and δ15N nor connectivity in food resource utilization (based on δ13C), indicating no biomagnification among these fish species. In addition, Hg concentrations were not significantly correlated to total fish length in any of the species. Fish species in the present study have low Hg content accompanied by low biomagnification through the studied fish community.

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Published

2019-12-31

How to Cite

Acharya, P., Sharma, C. M., Kang, S., Tripathee, L., Guo, J., Paudyal, R., Zhang, Q., Bhattarai, H., & Sillanpää, M. (2019). Bioaccumulation of mercury in fishes of Jagadishpur Reservoir, Nepal. Nepal Journal of Environmental Science, 7, 17–23. https://doi.org/10.3126/njes.v7i0.34370

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Section

Research Articles