Aluminium toxicity to an edible fresh water fish, Channa punctatus has been studied in aquarium model. 10 fish in each case were exposed to 50 ppm and 25 ppm concentration of Al3+ in the form of aluminium sulphate for 50 days or till total mortality, whichever was earlier. Similar number of fish were also studied in the Control set. Mortality of the fish was recorded. At the end, the fish that died last in case of Experimental sets and five surviving fish of Control set were sacrificed. Aluminium uptake by the tissue of the fish in different parts viz., head, middle and tail part was studied. Results revealed that the exposure of fish to aluminium concentration of 50 ppm is acutely toxic. By 96 hours, all the fish died. In case of 25 ppm Al 3+ exposure, the toxicity was found to be chronic. 50% of the fish died gradually in 50 days. The upper part of fish (brain and gills) were found to be the major sites of aluminium accumulation. The lower part (tail) showed relatively low aluminium accumulation. The total aluminium uptake by fish tissue was found to be 4.47 mg/g by 96 hours, in case of 50 ppm Al3+ exposure, and 4.80 mg/g by 50 days, in case of 25 ppm Al3+ exposure.
