The 120 hrs median lethal concentration of polycyclic aromatic hydrocarbon effluent were found to be 20 ppt for Cirrhinus mrigala. Effect on serum enzymes Serum glutamate oxaloacetate transaminase (SGOT) The figure 1 represents the level of SGOT in response to polycyclic aromatic hydrocarbon effluent in serum of Cirrhinus mrigala.