Scanning Electron Microscopic Studies on the Gills of the Catfish Heteropneustes fossilis (Bloch) Exposed to Copper at Varying pH.

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.