Document Detail

Mercury exposure in the freshwater tilapia Oreochromis niloticus.
MedLine Citation:
PMID:  20493602     Owner:  NLM     Status:  MEDLINE    
Mercury (Hg) can be strongly accumulated and biomagnified along aquatic food chain, but the exposure pathway remains little studied. In this study, we quantified the uptake and elimination of both inorganic mercury [as Hg(II)] and methylmercury (as MeHg) in an important farmed freshwater fish, the tilapia Oreochromis niloticus, using (203)Hg radiotracer technique. The dissolved uptake rates of both mercury species increased linearly with Hg concentration (tested at ng/L levels), and the uptake rate constant of MeHg was 4 times higher than that of Hg(II). Dissolved uptake of mercury was highly dependent on the water pH and dissolved organic carbon concentration. The dietborne assimilation efficiency of MeHg was 3.7-7.2 times higher than that of Hg(II), while the efflux rate constant of MeHg was 7.1 times lower. The biokinetic modeling results showed that MeHg was the greater contributor to the overall mercury bioaccumulation and dietary exposure was the predominant pathway.
Rui Wang; Ming-Hung Wong; Wen-Xiong Wang
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-05-20
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  158     ISSN:  1873-6424     ISO Abbreviation:  Environ. Pollut.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-12     Completed Date:  2010-11-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  2694-701     Citation Subset:  IM    
Copyright Information:
Copyright 2010 Elsevier Ltd. All rights reserved.
Department of Biology, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong.
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MeSH Terms
Cichlids / metabolism*
Environmental Exposure / analysis*
Food Chain
Fresh Water / chemistry*
Mercury / analysis*,  metabolism
Methylmercury Compounds / analysis,  metabolism
Water Pollutants, Chemical / analysis*,  metabolism
Reg. No./Substance:
0/Methylmercury Compounds; 0/Water Pollutants, Chemical; 7439-97-6/Mercury

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