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Ultrastuctural study of gill morphology alterations in Channa punctatus (Bloch) exposed to sub lethal concentration of Mercury

Kiran Kumari, Snehlata Nag, Ranu Naskar & N.S.Sen*
Department of Zoology, Ranchi University, Ranchi 834 008, India

Received 27th Dec. 2006; Revised 16th Feb. 2007

Abstract: Fish gills are main target for many aquatic pollutants in general being the most seriously affected organs due to its direct contact with aquatic environments. Therefore the present study was undertaken to assess the toxicity of mercury (mercuric chloride, HgC12) on gill surface of fresh water teleost, Channa punctatus under acute exposure for 96 hrs. The SEM studies of treated groups revealed several kinds of morphological alterations and modifications like distortion of branchial epithelium, epithelial cell elevation, odema of lamellar cells, lamellar fusion and abnormal growth leading to basal and distal hyperplasia.

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