Effects of NaCl Addition on Transport Stress on Blood Indices, Blood Serum Biochemical Parameters and Skin Mucus in White Fish (Rutilus frisii kutum)

Purchase, transportation and maintenance of fish became and important chain in aquaculture industry along with the increase of farmers. Transporting of fishes is an stressful process in aquaculture. The present study investigate the effect of adding NaCl in transporting stress, on haematological parameters, blood serum biochemical parameters and skin mucus of Caspian white fish. For this purpose, along with the transporting fish to laboratory different concentrations of NaCl (0, 1, 3 and 6) were added to the trasnporting water. The samples of mucus and blood were taken immediately after transferring. Fish transferred to the seawater for one week and samples were collected after three days and one week. The result of this study showed that the RBC and hematocrit increased significantly over time after the salinity stress (P<0.05) and the amount of the hemoglobin, blood glucose and the total number of skin mucus bacteria decreased significantly over time after the salinity stress (P<0.05). However, there was no significant change in the amount of white blood cell, differential count of white blood cells, hemoglobin, mean volume of cell, the average concentration of cell hemoglobin and cortisol (P>0.05). Generally, it can be concluded that transported fishes with 1 g/litr salt in transporting water had better condition regarding immune parameters compared control group and other treatments.