University of Guilan Aquatic Physiology and Biotechnology 2345-3966 9 3 2021 11 22 The study on the effect of oregano essential oil (Zataria multiflora) and ginger powder (Zingiber afficinale) on growth performance immunity system and blood parameters of Common carp (Cyprinus carpio) The study on the effect of oregano essential oil (Zataria multiflora) and ginger powder (Zingiber afficinale) on growth performance immunity system and blood parameters of Common carp (Cyprinus carpio) 67 88 5298 10.22124/japb.2021.18588.1407 FA Seyede Rahime Razavi Amri M.Sc. in Aquaculture, Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran Hosna Gholipour Kannani Associate Professor in Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran Mohamad Farhangi Associate Professor in Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran Hossein Adineh Assistant Professor in Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran Journal Article 2021 01 08 The aim of this study was to evaluate the effects of herbal supplements including <em>Zataria multiflora</em> essential oil and ginger (<em>Zingiber officinale</em>) powder in order to achieve goals such as growth performance, immunity system and blood parameters of common carp. The fishes with the average weight and length of 107.08±0.58g and 20.01±0.08cm respectively, were fed during 35 days. The experiment was done with 3 treatments with triplicate including a control (T1), <em>Z. multiflora</em> essential oil (T2) with 10g/kg feed and ginger powder (T3) with 10g/kg feed. Growth indices and nutrition performance, hematological parameters, immunity system and digestive enzymes were measured. Results showed there were significant differences in W_f, SGR, FCR, PER and LER in the treatments (P<0.05). The lowest value of FCR was obtained in treatments fed with ginger powder which was 1.38 (P<0.05). The results revealed that the highest amount of protease and lipase enzymes were obtained in the ginger powder treatment which had a significant difference compared to the control treatment (P<0.05). The highest hemoglobin content of common carp was obtained in the treatment containing ginger powder, which was statistically significant compared to the control treatment (P<0.05). The percentage of blood hematocrit in both experimental treatments was lower than control (P<0.05). However, findings of this study suggest that ginger powder performance was positive and significant on growth indices and immunity system compared to oregano essential oil. The aim of this study was to evaluate the effects of herbal supplements including <em>Zataria multiflora</em> essential oil and ginger (<em>Zingiber officinale</em>) powder in order to achieve goals such as growth performance, immunity system and blood parameters of common carp. The fishes with the average weight and length of 107.08±0.58g and 20.01±0.08cm respectively, were fed during 35 days. The experiment was done with 3 treatments with triplicate including a control (T1), <em>Z. multiflora</em> essential oil (T2) with 10g/kg feed and ginger powder (T3) with 10g/kg feed. Growth indices and nutrition performance, hematological parameters, immunity system and digestive enzymes were measured. Results showed there were significant differences in W_f, SGR, FCR, PER and LER in the treatments (P<0.05). The lowest value of FCR was obtained in treatments fed with ginger powder which was 1.38 (P<0.05). The results revealed that the highest amount of protease and lipase enzymes were obtained in the ginger powder treatment which had a significant difference compared to the control treatment (P<0.05). The highest hemoglobin content of common carp was obtained in the treatment containing ginger powder, which was statistically significant compared to the control treatment (P<0.05). The percentage of blood hematocrit in both experimental treatments was lower than control (P<0.05). However, findings of this study suggest that ginger powder performance was positive and significant on growth indices and immunity system compared to oregano essential oil. https://japb.guilan.ac.ir/article_5298_243eca1d83afb14596949d0e32b798f5.pdf