Investigation of Effects of Different Concentrations of Treated Wastewater Effluent on Blood Biochemical Factors, Cortisol Level, Liver and Gill Tissues of Silver Carp (Hypophthalmichthys molitrix)

The present study aimed to investigate the effects of different concentrations of effluent from municipal wastewater treatment plants on blood biochemical factors, cortisol level of blood, liver and gill tissue of silver carp (Hypophthalmichthys molitrix) in a culture system. The experiment was conducted as five treatments, 0% (control, 1), 25% (2) 50% (3), 75 % (4) and 100% (5) waste water concentrations in triplicates. During two months as an experimental period, the fish were fed with a commercial pellet (Fradaneh Factory product) and the rate of mortality was recorded .the rates of mortality were 8%, 12%, 12, 20% and 16% in treatments 1, 2, 3, 4 and 5, respectively. According to the results, with increasing in concentration of treated wastewater, cortisol levels of blood increased significantly (P