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Alterations in gill ultra-structure of the catfish, Heteropneustes fossilis exposed to copper at varying pH were investigated using scanning electron microscopy. Fish were treated with 3 ppm copper sulphate (48 h LC50 concentration at pH 7 ± 0.5) at varying pH of diluent water. Low pH resulted in higher copper (30.01 µg/g dry wt.) accumulation on gills as compared to neutral and high pH treatments,...
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