have found that the presence of hemosiderosis and
vacuolation in the renal tubules of effluent treated fish,
Heteropneustes fossilis reveals the dynamic process of events
involving vascular and exudative stages occurring due to
toxicity induced by the toxicants in the effluent. The kidney
of fish receives much of the largest portion of postbranchial
blood and therefore renal lesions might be expected to be a
good indicator of environmental pollution.