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, 200-300m 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 75μgkg-1 (wet weight), and the dietary intake of MeHg through fish consumption for Hong Kong residents was 0.37μgkg-1week-1, which was lower than the corresponding WHO limits (500μgkg-1 and 1.6μgkg-1week-1).
Original language | English |
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Pages (from-to) | 1038-1043 |
Number of pages | 6 |
Journal | Chemosphere |
Volume | 82 |
Issue number | 7 |
DOIs | |
Publication status | Published - Feb 2011 |
Scopus Subject Areas
- Environmental Engineering
- Environmental Chemistry
- General Chemistry
- Pollution
- Health, Toxicology and Mutagenesis
User-Defined Keywords
- Cultured fish
- Fish feed
- Mariculture
- Methylmercury
- Sediment