Mercury (Hg) concentrations in four commercial fish species (Tilapia Oreochromis niloticus, Spiny Eel Mastacembelus armatus, African catfish Clarias gariepinus, and Sahar Tor putitora), were investigated in Lake Phewa, Nepal. Mean values of total mercury (THg mg kg−1, ww) in these fishes were 0.02, 0.07, 0.05, and 0.12 respectively. Methylmercury contributed 82 % of THg. The lowest value was detected in O. niloticus, an exclusive plant feeder. The biomagnification rate of Hg through the fish community was 0.041 per δ15N (‰). The present investigation produced an important baseline data of Hg pollution in the fish community in this region.
Mercury Commercial fish Biomagnification Lake Phewa
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The first author (Chhatra Mani SHARMA) is supported by Chinese Academy of Sciences as a Young International Scientist (Grant # 2009Y2AZ10). The additional supports were from the National Nature Science Foundation of China (Grant # 40830743) and the State Key Laboratory of Cryospheric Science (SKLCS-ZZ-2008-01). Kiran Maharjan (diet analysis), Solfrid Lohne and Gjermund Strømman (analysis of Hg and stable isotopes), Roshan Raut, Prabina Tiwari and Prabesh Sing Kunwar (fish sampling) also deserve many thanks.
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