Effect of dietary golder powder (Otostegia persica) on blood parameters, antioxidant defense and immune of common carp (Cyprinus carpio)

The aim of this study was to investigate the effect of a diet containing golder powder (Otostegia persica) on blood parameters, antioxidant and immunological responses in common carp (Cyprinus carpio). For this purpose, fish with a mean weight of 28.32±2.12g were distributed in aquariums and were fed with 0 (control), 0.5 (T1), 1 (T2) and 1.5% (T3) of golder powder for 45 days. At the end of the period, blood samples were collected from fish and immunological parameters and antioxidant enzymes evaluated. The results showed that the addition of plant powder to the diet did not cause significant changes in hematological indices (RBC and WBC count and hematocrit) and RBC indices (MCV, MCH and MCHC) between experimental treatments (P>0.05). Also, liver enzymes alanine transaminase (ALT), alkaline phosphatase (ALP) and aspartate transaminase (AST) were not significantly different (P>0.05). The highest total protein was observed in fish fed with T2 and the control group has the lowest level, and there was a significant difference between treatments containing 1 and 1.5% of plant powder and other treatments (P<0.05). Albumin, triglyceride and cholesterol of fish fed with golder powder were not significantly different at the end of the experiment with control treatment (P>0.05). Catalase, glutathione peroxidase and superoxide dismutase had the highest levels in fish fed with diets containing 1 and 1.5% of golder powder (P<0.05). The amount of malondialdehyde decreased significantly with increasing the amount of plant powder in the diet (P<0.05). Generally, golder powder has a positive effect on serum antioxidant parameters in this study.