Heavy Metal Contamination in the Cultivated Oyster <Emphasis Type="Italic">Crassostrea rivularis</Emphasis> and Associated Health Risks from a Typical Mariculture Zone in the South China Sea |
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Authors: | Hongtian Luo Qing Wang Xiangping Nie Hui Ren Zhuo Shen Xinfei Xie Yufeng Yang |
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Institution: | 1.Institute of Hydrobiology, Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms, Guangdong Higher Education Institutes,Jinan University,Guangzhou,People’s Republic of China |
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Abstract: | With the rapid development of mariculture in potentially contaminated regions in China and the world, food safety, is a growing concern. To evaluate heavy metals and their associated health risks in the cultivated oyster Crassostrea rivularis, the concentrations of heavy metals (Cd, Cr, Pb, Zn) in oysters and water/sediment were examined in a typical mariculture environment (Kaozhou Bay, South China Sea). Trends in the seasonal dynamics of heavy metals in oysters revealed a potential synergistic effects among the concentrations of Cd, Cr, and Zn; trends associated with Pb were less clear, although the ability of oysters to bioaccumulate and depurate Pb was excellent. Bioconcentration factors (BCF) indicated that C. rivularis has a strong ability to accumulate heavy metals, and the BCF was the highest for Zn (2.32?×?105), followed by Cd (6.84?×?104), Pb (2.77?×?104) and Cr (1.23?×?103) through the four seasons. Results showed that Cd concentrations in oysters could pose a risk to human health (HQ?>?1). This study, therefore, suggests that there are potential human health risks due to heavy metal exposure through the consumption of C. rivularis from mariculture zones in South China Sea. |
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