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- Title
Disease resistance of pacu Piaractus mesopotamicus (Holmberg, 1887) fed with β-glucan.
- Authors
Biller-Takahashi, J. D.; Takahashi, L. S.; Marzocchi-Machado, C. M.; Zanuzzo, F. S.; Urbinati, E. C.
- Abstract
Effects of β-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% β-glucan were injected with A. hydrophila. β-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 β-glucan concentration. Lysozyme activity was higher after infection and showed a gradual increase as β-glucan concentration increased. A significant elevation in WBC count was observed either after bacterial challenge or by influence of β-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 β-glucan can increase protection against A. hydrophila, due to changes in non-specific immune responses.
- Subjects
TAMBAQUI; GLUCANS; IMMUNE response; NATURAL immunity; AEROMONAS hydrophila; LYSOZYMES; MONOCYTES
- Publication
Brazilian Journal of Biology, 2014, Vol 74, Issue 3, p698
- ISSN
1519-6984
- Publication type
Article
- DOI
10.1590/bjb.2014.0083