Disease resistance of pacu Piaractus mesopotamicus (Holmberg, 1887) fed with β-glucan

Brazilian Journal of Biology

Jd Biller-takahashi¹  Ls Takahashi¹  Cm Marzocchi-machado¹  Fs Zanuzzo¹  Ec Urbinati¹ 

关键词: immunology;    complement system;    innate immunity;    lysozyme;    respiratory burst activity of leukocytes;    imunologia;    sistema complemento;    imunidade inata;    lisozima;    atividade respiratória de leucócitos;   

DOI  :  10.1590/bjb.2014.0083

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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