Abstract
Tolerance bioaccumulation and biotransformation of arsenic compounds by a freshwater prawn (Macrobrachium rosenbergii) were investigated. M. rosenbergii was exposed to 10, 20, 30 and 35 μg As cm -3 of disodium arsenate [abbreviated as As(V)], 25, 50, 100 and 120 μg As cm -3 of methylarsonic acid (MMAA), or 100, 200, 300 and 350 μg As cm -3 of dimethylarsinic acid (DMAA). Tolerances (50% lethal concentration : LC 50 ) of the prawn against As(V), MMAA, and DMAA were 30, 100, and 300 μg As cm -3 , respectively. The prawn accumulated arsenic compounds directly from aqueous phase and biotransformed them in part. Both methylation and demethylation of the arsenicals were observed in vivo. Highly methylated and less toxic arsenicals were less accumulated in M. rosenbergii.
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