Disease resistance of pacu Piaractus mesopotamicus (Holmberg, 1887) fed with beta -glucan/Resistencia a doenca em pacu, Piaractus mesopotamicus (Holmberg, 1887), alimentados com beta -glucana

Effects of beta -glucan on innate immune responses and survival were studied in pacu experimentally infected with Aeromonas hydrophila. Fish fed diets containing 0%, 0.1% and 1% beta -glucan were injected with A. hydrophila. beta -glucan enhanced fish survival in both treated groups (26.7% and 21.2% of the control, respectively). Leukocyte respiratory burst and alternative complement pathway activities were elevated after bacterial challenge regardless the beta -glucan concentration. Lysozyme activity was higher after infection and showed a gradual increase as beta -glucan concentration increased. A significant elevation in WBC count was observed either after bacterial challenge or by influence of beta -glucan separately. The same response was observed in the number of thrombocytes, lymphocytes, eosinophils, LG-PAS positive cell and monocytes. It can be concluded that feeding pacu with beta -glucan can increase protection against A. hydrophila, due to changes in non-specific immune responses.