title: Enhancement of immunity and disease resistance in the white shrimp, Litopenaeus vannamei, by the probiotic, Bacillus subtilis E20.
abstract: Effects of Bacillus subtilis E20 isolated from fermented soybean on immune parameters and the disease resistance of the white shrimp (Litopenaeus vannamei) after 98 days of B. subtilis E20 feeding were evaluated in this study. Shrimp fed B. subtilis E20-containing diets at concentrations of 10(6) (E206), 10(7) (E207), and 10(8) (E208)cfu kg(-1), respectively, had significantly increased survival rates of 13.3%, 16.7%, and 20%, compared to the control (fed no probiotic) after being challenged with Vibrio alginolyticus. There were no significant differences in the total hemocyte count, respiratory burst, or superoxide dismutase glutathione peroxidase among all treatments. Shrimp fed a higher concentration of the probiotic (E208) exhibited significant increases in phenoloxidase activity, phagocytic activity, and clearance efficiency compared to control shrimp. In addition, B. subtilis E20 showed a weaker inhibitory effect against the growth of Aeromona hydrophila with around a 0.3-cm inhibitory zone, but showed no inhibitory effects against other selected pathogens, such as white shrimp pathogens: V. alginolyticus and Vibrio vulnificus. These results suggest that the increased resistance of shrimp after B. subtilis E20 consumption occurs through immune modifications, such as increases in phenoloxidase activity, phagocytic activity, and clearance efficiency against V. alginolyticus.
authors.affiliation: Department of Biological Sciences and Technology, National University of Tainan, Tainan, Taiwan, 700, Taiwan, ROC.
authors.forename: Deng-Yu
authors.initials: DY
authors.lastname: Tseng
authors.forename: Pei-Lin
authors.initials: PL
authors.lastname: Ho
authors.forename: Sung-Yan
authors.initials: SY
authors.lastname: Huang
authors.forename: Sheng-Chi
authors.initials: SC
authors.lastname: Cheng
authors.forename: Ya-Li
authors.initials: YL
authors.lastname: Shiu
authors.forename: Chiu-Shia
authors.initials: CS
authors.lastname: Chiu
authors.forename: Chun-Hung
authors.initials: CH
authors.lastname: Liu
mesh_terms: D000818:Animals; D001412:Bacillus subtilis / Q000276:immunology*; D004032:Diet / Q000662:veterinary; D005393:Fish Diseases / Q000276:immunology / Q000517:prevention & control; D005979:Glutathione Peroxidase / Q000378:metabolism; D006434:Hemocytes / Q000201:enzymology; D007113:Immunity, Innate / Q000276:immunology*; D014442:Monophenol Monooxygenase / Q000378:metabolism; D033561:Penaeidae / Q000276:immunology* / Q000382:microbiology*; D010587:Phagocytosis / Q000276:immunology; D019936:Probiotics / Q000008:administration & dosage; D016897:Respiratory Burst / Q000276:immunology; D013482:Superoxide Dismutase / Q000378:metabolism; D016019:Survival Analysis
chemical_list: D005979:Glutathione Peroxidase; D014442:Monophenol Monooxygenase; D013482:Superoxide Dismutase