Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26326
Title: The influence of mariculture on mercury distribution in sediments and fish round Hong Kong and adjacent mainland China waters
Authors: Liang, P
Shao, DD
Wu, SC
Shi, JB
Sun, XL
Wu, FY
Lo, SCL 
Wang, WX
Wong, MH
Keywords: Methylmercury
Mariculture
Sediment
Cultured fish
Fish feed
Issue Date: 2011
Publisher: Pergamon Press
Source: Chemosphere, 2011, v. 82, no. 7, p. 1038-1043 How to cite?
Journal: Chemosphere 
Abstract: To study the influence of mariculture on mercury (Hg) speciation and distribution in sediments and cultured fish around Hong Kong and adjacent mainland China waters, sediment samples were collected from six mariculture sites and the corresponding reference sites, 200-300 m away from the mariculture sites. Mariculture activities increased total mercury, organic matter, carbon, nitrogen and sulfur concentrations in the surface sediments underneath mariculture sites, possibly due to the accumulation of unconsumed fish feed and fish excretion. However, methylmercury (MeHg) concentrations and the ratio of MeHg to THg (% MeHg) in sediments underneath mariculture sites were lower than the corresponding reference sites. The % MeHg in sediments was negatively correlated (r = -0.579, p < 0.05) with organic matter (OM) content among all sites, indicating that OM may have inhibited Hg methylation in surface sediments. Three mariculture fish species were collected from each mariculture site, including red snapper (Lutjanus campechanus), orange-spotted grouper (Epinephelus coioides) and snubnose pompano (Trachinotus blochii). The average MeHg concentration in fish muscle was 75 mu g kg(-1) (wet weight), and the dietary intake of MeHg through fish consumption for Hong Kong residents was 0.37 mu g kg(-1) week(-1), which was lower than the corresponding WHO limits (500 mu g kg(-1) and 1.6 mu g kg(-1) week(-1)).
URI: http://hdl.handle.net/10397/26326
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/j.chemosphere.2010.10.061
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