Journal of Applied and Natural Science 2(2):234-238(2010)
Chromium, nickel and zinc induced histopathological alterations in the gill of Indian common carp Labeo rohita (Ham.)
N. V. Bhatkar
Department of Zoology, Shri Shivaji College, Akot- 444101(MS), INDIA
Abstract : Degenerative histopathalogical alterations were seen in gills due to chronic exposure of the fish, Labeo rohita to chlorides of chromium, nickel and zinc for 30 days. However, more severe degenerative changes were observed in case of zinc chloride exposed fish than nickel chloride and chromium chloride treated fishes, indicating more toxic nature of zinc chloride. Mucus secretion over the gill lamellae was seen prominently in all the experimental fishes. However, in zinc chloride treated fish there was excessive mucus secretion after ten days of exposure and after thirty days, epithelial lifting was seen. In chromium chloride and nickel chloride treated fishes there was basal hyperplasia, which indicated compensatory mechanism in ion regulation to adjust with the toxic stress.
Keywords : Chromium, Nickel, Zinc, Labeo rohita, Gill