Leukocyte phagocytosis and lysozyme activity in Nile tilapia fed supplemented diet with natural extracts of propolis and Aloe barbadensis

摘要: Although there is evidence on the benefits in use of immunostimulants aquaculture, are few commercial products being used. This study evaluated natural substances as potential sources for production immunostimulants. Propolis and Aloe barbadensis have been widely studied its extracts different chemical constituents responsible antimicrobial, anti-inflammatory immunostimulant. Tilapia juveniles were fed two weeks with diets supplemented mix propolis aloe (1:1) concentrations: 0.5, 1 e 2%. After experimental period, fish blood was collected hematoimmunological follows : hematocrit, total plasma protein, erythrocytes (RBC), leukocytes (WBC), differential leukocyte count, phagocytic activity, serum lysozyme antimicrobial activity (evaluated against Aeromonas hydrophila, Enterococcus durans Escherichia coli). Except higher number thrombocytes 1%-supplemented fish, rest did not show significant difference.