Aim of this study was to investigate Cr toxicity by using a commercially valuable freshwater fish, Grass Carp, Ctenopharyngodon idella. Investigation included bioaccumulation of Cr in various tissues. For this purpose the fish was exposed to sub lethal concentration of hexavalent chromium for 14 days, following all the ethical issues. Twelve fish of about 70.45±2.91 g weight and 7.32±0.16 inches length were used in the experiments. Dry commercial food pellets were used to feed the fish. Chromium was estimated after acid digestion of the sample tissues taken and further analyzed through atomic absorption spectrophotometer. Results of the current study showed that the order of Cr accumulation in various organs was in the order of intestine>liver>gills>skin>muscles>swim bladder.
Key words: Bioaccumulation, chromium, grass carp.
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