Abstract
Indian flying barb (Esomus danricus) was exposed to sublethal concentrations of 636.3, 63.6 and 6.3 µgl -1 Cadmium for 28 days and intestinal histopathology was observed by light microscopy after staining with Haematoxylin-Eosine. Exposed fishes showed severe to mild superficial erosion of mucosa, dense lamina propria, chronic inflammatory cell infiltration as well as vacuolation. With the increase in exposure dose, severity of effects was observed.
Highlights
Cd is a non essential heavy metal, mainly used for rechargeable nickel-cadmium batteries, pigments, coatings and plating, and as stabilizers for plastics[1]
The result of the effect of Cd on the gastrointestinal system of Esomus danricus clearly show that this heavy metal exert toxic effects on the different layers of intestine
Toxic lesions most common in the intestine of fishes exposed to cadmium chloride include hyperemia, degenerative changes in the tips of villi, loss of structural integrity of mucosal folds, degenerative mucosal epithelium necrosis, desquamation of mucosal epithelium, cellular debris, excessive mucus in gut of lumen, necrosis of submucosa and inflammatory infiltration of submucosa[11,12,13]
Summary
Cd is a non essential heavy metal, mainly used for rechargeable nickel-cadmium batteries, pigments, coatings and plating, and as stabilizers for plastics[1]. Cadmium naturally occurs in the aquatic environment, but is of no known biological use and is considered one of the most toxic metals[2]. The Indian flying barb, Esomus danricus (HamiltonBuchanan) is an economically important cyprinid fish which mostly inhabits shallow water bodies of Northern India. This fish, owing to its particular habitat, runs the risk of being exposed to water borne toxicants including, Cd. It is very much essential to devise a rapid method to detect the effects of toxicants in various organs of fish and histopathology is one such effective tool[6]. The present study was aimed to determine the histopathological effects of chronic doses of Cd to Indian flying barb intestine
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