Surfactants such as linear alkylbenzene sulfonates (LAS) are widely used in the formulation of detergents in commercial products. After utilization, they are discharged to aquatic ecosystems, causing risk to aquatic life. In the present study, the liver histological damage of the Caspian Kutum, Rutilus frisii kutum, exposed to three sublethal concentrations of Surfactant detergent, Linear Alkylbenzene Sulfonate (LAS) for short terms intervals (24,48,72 and 96 hours) is assessed. Histopathological changes observed in liver structure include irregular-shaped nuclei, congestion and dilation of sinusoid. Results demonstrated that exposure duration affected the liver tissues of Caspian kutum more than the concentration of LAS did.
