Abstract
Ha Noi lakes are of great ecological interest, but they are suffering from many pollution sources, especially wastewater discharge. Aquatic organisms living, especially Oreochomic mossambicus and Labeo rohita cultured in polluted water for local consumption would pose a threat to human health. The research attempted to understand the metal accumulation in these two fish species and in Macro zooplankton (> 200 µm) living in lakes of Hanoi. Various metals showed different affinity to fish species and their tissues. Metal accumulation factors (BAF) in livers ranged from 4 to 23 is much higher than that in muscles ranged from 0.04 to 2.07. The variation of metal accumulation in fish statistically correlated to the temperature of water. Metal concentration in macrozoo plankton varied during the period of sampling. The results showed the increase in metal accumulation from lower to upper trophic levels in food webs.
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