Histological observations in gills of the teleost Sarotherodon mossambicus with reference to mercury toxicity

Effect of lethal (1.5 ppm) and sublethal (0.1 ppm) concentrations of HgCl2 on gills of Sarotherodon mossambicus were studied by routine histological techniques. Many histological alterations were observed in gill lamellae, such as bulging at basal and distal parts of the lamellae, hypertrophy and hyperplasia of lamellar and interlamellar cells, separation of respiratory epithelial layer, atrophy, and necrosis of gill lamellae.