Mercury Concentrations in the Fish Community from Indrawati River, Nepal
This study quantified concentrations of mercury (Hg) and its trophic transfer along the fish community in the Indrawati River, Nepal. Stable isotope ratios of nitrogen (δ15N) and carbon (δ13C), complemented by stomach contents data were used to assess the food web structure and trophic transfer of Hg in 54 fishes; 43 Shizothorax richardsonii and 11 Barilius spp. [B. bendelisis (1), B. vagra (3) and B. barila (7)]. Sixty-one muscle samples (including six replicates) were used for the analysis of total mercury (THg) and stable isotopes. Mean THg concentrations in B. spp. and the more common species S. richardsonii was observed to be 218.23 (ng/g, ww) and 90.82 (ng/g, ww), respectively. THg versus total length in both S. richardsonii and B. spp. showed a decreasing tendency with an increase in age. Regression of logTHg versus δ15N among the fish species showed a significant positive correlation only in S. richardsonii indicating biomagnification along the trophic level in this species.
KeywordsBioaccumulation Biomagnification Himalayan River
The financial support from the National Natural Science Foundation of China (Grant No. 41630754), Chinese Academy of Sciences (XDB03030504, 2009Y2AZ10), State Key Laboratory of Cryospheric Sciences (SKLCS-ZZ-2013-01-01) and Academy of Finland (Grant # 264307) are highly appreciated.
- Badola SP, Singh HR (1980) Food and feeding habits of fishes of the genera Tor. Puntius and Barilius. Proc Indian Nat Sci Acad B 46(1):58–62Google Scholar
- Sah SK, Acharya P, Lance VA (2002) Effect of industrial pollution on fish in the Narayani River, Central Nepal. Nepal J Sci Technol 4:5–14Google Scholar
- Shekhar C, Malhotra YR, Dutta SPS (1993) Food and feeding habits of Schizothorax richardsonii (Gray and Hard) inhabiting Neerunullah, Bhaderwah, Jammu. J Indian Inst Sci 73:247–251Google Scholar
- Vander Zanden MJ, Rasmussen JB (2001) Variation in delta N-15 and delta C-13 trophic fractionation: implications for aquatic food web studies. Limnol Oceanogr 37(6):1313–1318Google Scholar