Risk assessment of heavy metal contamination in shrimp farming in Mai Po Nature Reserve, Hong Kong

Environmental Geochemistry and Health
K C Cheung, M H Wong

Abstract

An ecological survey was carried out to determine the sediment concentrations of nutrients and heavy metals and bioaccumulation of heavy metals in fish and shrimp including tilapia (Oreochromis mossambicus x O. nilotica), grey mullet (Mugil cephalus), gei wai shrimp (Metapenaeus ensis) and caridean shrimp (Macrobrachium nipponensis) in the traditional tidal shrimp ponds (gei wais) of Mai Po Nature Reserve, Hong Kong. The sediments collected from the landward sites contained higher nutrient contents, as well as zinc (Zn), chromium (Cr), copper (Cu), nickel (Ni) and cadmium (Cd) than those collected from the seaward sites, but vice versa for lead (Pb) and mercury (Hg). However, the concentrations of all metals were exceptionally high in the two sites located outside the reserve, suggesting that waters from Deep Bay might be the possible source of metal contamination affecting the reserve. All metals studied seemed to accumulate in the viscera of fish. Body size was the determining factor for the accumulation of heavy metals in caridean shrimp and gei wai shrimp but not fish. Concentrations of the metals studied in tissues of grey mullet and gei wai shrimp were found to be safe for human consumption. Concentrations of Cr in tilapi...Continue Reading

References

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Sep 1, 1988·The Annals of Thoracic Surgery·I A Sarot
Mar 16, 2001·Breast Cancer Research : BCR·E T Liu

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Citations

May 20, 2014·Ecotoxicology and Environmental Safety·C K KwokM H Wong
Oct 11, 2014·Chemosphere·C G Delgado-AlvarezM G Frías-Espericueta
Apr 9, 2016·Environmental Science and Pollution Research International·Jun-Min GaoKe Zhang
Feb 15, 2013·Toxicology and Industrial Health·Fazel Abdolahpur MonikhKamal Ghanemi
Mar 16, 2019·Environmental Geochemistry and Health·Ruipeng TongJianfeng Li

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