Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Apr 2006, 27 (2) BackEffects of sub-lethal concentrations of zinc on
histological changes and
bioaccumulation of zinc by kidney of fish Channa punctatus (Bloch) Pallavi Gupta and Neera Srivastava Fish
Biology Laboratory, Department of Zoology, (Received:
24 April, 2004 ; Accepted: 25 October, 2004) Abstract: Fresh
water fish , Channa punctatus were exposed to three sub-lethal concentrations
of zinc (10 mg/l, 15 mg/l and 25 mg/l) for 15 days. The effects of this
exposure have been studied on bioaccumulation of zinc and histology of the
kidney at intervals of 8, 10 and 15 days. Statistically significant increase in
zinc concentration was noted in fish of all treated groups. Simultaneously,
severe histological changes were noted in the kidney of all exposed groups.
Both, bioaccumulation and histopathological changes were dose and duration
dependent. Post exposure recovery in fish was noted after transferring these
fish to normal tap water for another fortnight. Slow elimination of zinc was
observed though the concentration of zinc remained significantly higher than
controls till the end of the experiment. Histopathological changes observed in
the kidney also persisted. However, by the termination of the experiment kidney
of group II showed signs of mild recovery. Key words:
Channa punctatus, Zinc,
Kidney, Histology, Bioaccumulation. Copyright
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