Improvement of immunity and disease resistance in the Nile tilapia, Oreochromis niloticus, by dietary supplementation with Bacillus amyloliquefaciens

Fish & Shellfish Immunology
Khaled M Selim, Rasha M Reda

Abstract

Probiotics can be used as immunostimulants in aquaculture. The aim of this study was to evaluate the immune responses of Nile tilapia Oreochromis niloticus following feeding with Bacillus amyloliquefaciens spores at concentrations of 1 × 10(6) (G3) and 1 × 10(4) (G2) colony-forming units per gram (CFU/g) of feed compared with a basal diet with no probiotics (G1). A total of 180 fingerlings (27.7 ± 0.22 g) were divided into three groups (G1-G3 of 20 fish per group) in triplicate. Innate immunities were measured every two weeks based on serum bactericidal activity, lysozyme activity, a nitric oxide assay (mmo/l) and phagocytic activity, and the expressions of interleukin-1 (IL-1) and tumor necrosis factor alpha (TNF α) were examined after one month. Moreover, the survival of tilapia upon challenge with Yersinia ruckeri or Clostridium perfringens type D was determined at the end of feeding trial. After 15 d, the serum killing percentages and phagocytic activities were significantly higher in G3 than in G1 and G2, whereas the same parameters had significantly higher values in G3 and G2 than in G1 after 30 d. After both 15 d and 30 d, the lysozyme activities and nitric oxide assay results (mmo/l) were significantly higher in G3 than...Continue Reading

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Citations

Oct 18, 2019·International Journal of Veterinary Science and Medicine·Mary A OpiyoHarrison Charo-Karisa
Jan 19, 2020·Fish Physiology and Biochemistry·Felix K A KuebutornyeCai Xia Xie
Oct 30, 2018·Frontiers in Microbiology·Seyed Hossein HoseinifarZhigang Zhou
Dec 2, 2020·Annual Review of Animal Biosciences·Nuno BorgesRodrigo Costa
Mar 7, 2021·Animals : an Open Access Journal From MDPI·Wenying ZhangHengbo Shi
May 15, 2021·Frontiers in Immunology·Rocío SimónPatricia Díaz-Rosales

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