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The main objective of the present study is to improve the immune power of  Cyprinus carpio  by using  Euphorbia hirta  plant leaf extract as immunostimulants. The haematological, immunological and enzymatic studies were conducted on the medicated fish infected with  Aeromonas hydrophila  pathogen. The results obtained from the haematological studies show that the RBC count, WBC count and haemoglobin content were increased in the infected fish at higher concentration of leaf extract. The feeds with leaf extract of  Euphorbia hirta  were able to stimulate the specific immune response by increasing the titre value of antibody. It was able to stimulate the antibody production only up to the 5th day, when fed with higher concentrations of (25 g and 50 g) plant leaf extract. The plant extract showed non-specific immune responses such as lysozyme activity, phagocytic ratio, NBT assay, etc. at higher concentration (50 g) and in the same concentration (50 g), the leaf extract of  Euphorbia hirta  significantly eliminated the pathogen in blood and kidney. It was observed that fish have survival percentage significantly at higher concentration (50 g) of  Euphorbia hirta , when compared with the control. The obtained results are statistically significant at  P  < 0.05 and  P  < 0.01 levels. This research work suggests that the plant  Euphorbia hirta  has immunostimulant activity by stimulating both specific and non-specific immunity at higher concentrations.

Effect ofEuphorbia hirtaplant leaf extract on immunostimulant response ofAeromonas hydrophilainfectedCyprinus carpio