Evaluation of Growth Performance, Some Hematological and immune Parameters of Common Carp (Cyprinus carpio) Fingerlings Fed Acidifier Supplementation

In this research, it was studied the effect of acidifier supplementation on growth, hematological and immune indices of common carp (Cyprinus carpio) fingerlings. A completely randomized design was performed with four treatments in three replicates. Acidifier supplementation was added in four levels including 0, 2, 4, and 8 g/kg to the basal diet. A total number of 84 common carp fingerlingsweighing 18.30±2.08g were fed and kept at a density of 7 fish per aquarium in twelve 40-L aquaria for 60 days. Results showed that the highest final weight, body weight increase, average daily growth, specific growth rate and the lowest feed conversion ratio were observed at the level of 8g/kg acidifier supplementation (P<0.05). No significant difference was recorded in condition factor and survival rate among the treatments (P>0.05). Acidifier supplementation at the level of 8 g/kg showed significant difference (P<0.05) in RBC, hematocrit, hemoglobin and neutrophil counts with other treatments. Also, this treatment had the highest non-significant WBCs and monocyte counts (P>0.05). On the other hand, the highest values of IgM and lysozyme were showed in treatment 2g/kg acidifier supplementation (P>0.05). Based on obtained findings, it can be declared that acidifier supplementation can promote growth performance and improve some hematological and immune indices of common carp.