Accumulation and depletion of chromium in mystus vittatus (BLOCH)

Abstract

Summary: Exposure against two ppm chromium from K2CrZ07 for 1 to 7 mont.hs produced increasing accumulation of chromium in the liver, kidneys, brain and bone of the freshwater fish Mystus vittatus. In gonads, the accumulation of chromium was progressive for the first 5 months (i.e., April to August), but not in the subsequent 2months. After4 months exposure, fish transferred to chromium-free freshwater had a significant depletion of chromium from all tissues at 1 , 2 and 3 months. ItitroductionThe effluent disposal from widely established carpet ~.ashing and dyeing factories of Eastern U. P. containing 310 1 of tapwater, were serially arranged. In A, 0.283 g/l of potassium dichroinate was dissolved to obtain a standard sublethal concentration of 2.0 mg/l according to APIIA, while B was without chromium to serve as the control. 140 acclimatized fishes were sorted, divided into two groups equally, and each was released ih A and 13. At the end of 4 months exposure, the remaining individuals of A were Materials and Methods E.rperi))reTitnl