Histopathological Changes in the Gill of Freshwater Fish,Rasbora daniconius Exposed to Paper Mill Effluent

The fishes, Rasbora daniconius were exposed to lethal concentration at 9.5% (LC50 of 96 hrs) for 96 hrs and sublethal concentrations [1.9% (1/5) and 0.95% (1/10) LC50 of 96brs] of paper mill effluent for 30 days to study the impacts on the histology of gill. Many pathological changes were observed in the gill lamellae such as bulging at the tip of primary lamellae, epithelial hypertrophy, Fusion, curling, reduction in secondary gill lamellae, disorganization and rupture in secondary lamellae, swelling in pillar, mucous, and chloride cells. Hemorrhage at the primary and secondary lamellae.