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  • Title: Dietary supplementation of probiotic Bacillus licheniformis Dahb1 improves growth performance, mucus and serum immune parameters, antioxidant enzyme activity as well as resistance against Aeromonas hydrophila in tilapia Oreochromis mossambicus.
    Author: Gobi N, Vaseeharan B, Chen JC, Rekha R, Vijayakumar S, Anjugam M, Iswarya A.
    Journal: Fish Shellfish Immunol; 2018 Mar; 74():501-508. PubMed ID: 29305993.
    Abstract:
    The present study evaluated the dietary supplementation of probiotic Bacillus licheniformis Dahb1 on the growth performance, immune parameters and antioxidant enzymes activities in serum and mucus as well as resistance against Aeromonas hydrophila in Mozambique tilapia Oreochromis mossambicus. Fish (24 ± 2.5 g) were fed separately with three diets, 1) commercial diet (control), 2) diet containing probiotic at 105 cfu g-1 (D1) and 3) diet containing probiotic at 107 cfu g-1 (D2) for 4 weeks. Growth performance in term of final weight (FW) specific growth rate (SGR) and feed conversion ratio (FCR), immune parameters of total protein (TP), alkaline phosphatase (ALP), myeloperoxidase (MPO), lysozyme (LYZ), reactive oxygen species (ROS), reactive nitrogen species (RNS) and antioxidant parameters of superoxide dismutase (SOD) and glutathione peroxidase (GPx) in serum and mucus were evaluated after 2nd and 4th weeks. The FW, SGR, and FCR of fish fed with D1 and D2 significantly improved (p < 0.05). The activities of ALP, LYZ and MPO in the mucus were significantly higher (p < 0.05) in fish that fed D1 and D2. The TP, ROS, RNS, SOD and GPx in the serum were significantly higher (p < 0.05) in fish that fed D1 and D2. In addition, the challenge test showed that fish fed D1 and D2 enhanced significantly (p < 0.05) the resistance against A. hydrophila (1 × 107 cells ml-1). In conclusion, probiotic B. licheniformis Dahb1 can be applied in diet at 107 cfu g-1 to improve healthy status and resistance against A. hydrophila in tilapia farming.
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