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Heavy Metal Accumulation in Fish

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Water and Life in Tonle Sap Lake

Abstract

This chapter presents the investigation of the accumulation of heavy metals in six fish species obtained in four provinces around Tonle Sap Lake. They are the species commonly caught by fishermen in the lake. The results showed that the mean concentration levels of zinc, lead, chromium, copper, cadmium, and arsenic in the fish samples were below the maximum permissible limits (MPLs) set by the FAO/WHO. By contrast, the mean concentrations of manganese (Mn) and nickel (Ni) exceeded the MPL in all species, raising concerns about possible health problems caused by these metals. The highest concentration of Mn was found in Anabas testudineus (10.1 mg/kg-wet) followed by Boesemania microlepis (4.07 mg/kg), whereas the highest concentration of Ni was found in A. testudineus (0.79 mg/kg) followed by Channa micropeltes (0.41 mg/kg) and Boesemania microlepis (0.36 mg/kg). The predatory (carnivorous) fish A. testudineus also showed effective bioaccumulation of the other heavy metals, which is consistent with the findings of other studies. The presented results are valuable in the assessment of the safety of these fishes as important sources of protein for the villagers and other consumers.

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Correspondence to In Sokneang or Toru Watanabe .

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Sokneang, I. et al. (2022). Heavy Metal Accumulation in Fish. In: Yoshimura, C., Khanal, R., Sovannara, U. (eds) Water and Life in Tonle Sap Lake. Springer, Singapore. https://doi.org/10.1007/978-981-16-6632-2_38

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