Freshwater fish Rasbora daniconius and Puntius ticto were subjected to chronic toxicity assay to determine the degree of bioaccumulation of PCB 169 in gill, liver, kidney and intestine tissues. GC-MS was used to analyse bioaccumulation in the tissues.

Maximum bioaccumulation of the PCB congener 169 over a period of 30 days’ exposure was observed at 30.61 µg g-1 wet weight in the gill tissue of Puntius ticto, as compared to 7.12 µg g-1 wet weight in the gill tissue of Rasbora daniconius over the same period, clearly indicating its tendency to accumulate preferentially in gill tissue as compared to other tissues. Further, greater accumulation was detected in the fish Puntius ticto as compared to Rasbora daniconius.