Organ-specific accumulation, transportation, and elimination of methylmercury and inorganic mercury in a low Hg accumulating fish

Low mercury (Hg) concentrations down to several nanograms Hg per gram of wet tissue are documented in certain fish species such as herbivorous fish, and the underlying mechanisms remain speculative. In the present study, bioaccumulation and depuration patterns of inorganic Hg(II) and methylmercury (...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 2016-08, Vol.35 (8), p.2074-2083
Main Authors: Peng, Xiaoyan, Liu, Fengjie, Wang, Wen-Xiong
Format: Article
Language:English
Subjects:
Animals
Bioaccumulation
Biokinetics
Biological Transport
Environmental Exposure
Fish
Gills - metabolism
Herbivorous fish
Liver - metabolism
MeHg
Mercury
Mercury - analysis
Mercury - metabolism
Metallothionein - metabolism
Methylmercury
Methylmercury Compounds - analysis
Methylmercury Compounds - metabolism
Muscles - metabolism
Organ Specificity
Perciformes - metabolism
Proteins
Siganus canaliculatus
Species Specificity
Subcellular distribution
Tissue Distribution
Toxicology
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - metabolism
Water pollution
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Summary:Low mercury (Hg) concentrations down to several nanograms Hg per gram of wet tissue are documented in certain fish species such as herbivorous fish, and the underlying mechanisms remain speculative. In the present study, bioaccumulation and depuration patterns of inorganic Hg(II) and methylmercury (MeHg) in a herbivorous rabbitfish Siganus canaliculatus were investigated at organ and subcellular levels following waterborne or dietary exposures. The results showed that the efflux rate constants of Hg(II) and MeHg were 0.104 d−1 and 0.024 d−1, respectively, and are probably the highest rate constants recorded in fish thus far. The dietary MeHg assimilation efficiency (68%) was much lower than those in other fish species (∼90%). The predominant distribution of MeHg in fish muscle was attributable to negligible elimination of MeHg from muscle (
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.3363