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The present study was aimed at evaluating Bacillus subtilis subsp. inaquosorum strain IS02 (B.s.i. IS02; GenBank accession number: JN856456.1) to determine the growth kinetics of antimicrobial metabolite production in different ranges of environmental factors, such as salinity (15-55‰), pH (5-9), and temperature (30-40°C); to evaluate the lifespan of antimicrobial metabolites in different ranges of salinity (0-57‰), pH (2-12), and temperature (35-121°C); and to investigate the effect of B.s.i. IS02 as an additive to functional feed on the digestive activity of Litopenaeus vannamei under high-salinity conditions. Based on the present findings, the bacterium maintained its antimicrobial properties up to 45‰ salinity ( 10729.93 ± 23.93   A U   m l − 1 ). There was no significant difference in the antimicrobial activity of metabolites at 35°C and 40°C ( p &gt; .05 ). In the experimental trials, the shrimp postlarvae were fed different concentrations of B.s.i. IS02 (106, 107, and 108 CFU kg-1 diets) under high-salinity (&gt;55‰) conditions. The activity of digestive enzymes, amylase, lipase, and protease in the probiotic-fed shrimp postlarvae was significantly higher than that of the control group ( p &lt; .05 ). The present findings revealed that B.s.i. IS02 maintained the antimicrobial metabolite production, retained the antibacterial lifespan in high-salinity waters, and improved the growth and digestive enzyme activities of shrimps.

aquaculture nutrition

An In Vivo and In Vitro Assessment of the Probiotic Potentials of Indigenous Halotolerant Bacteria on Growth Performance and Digestive Enzymes of White Leg Shrimp (Litopenaeus vannamei) in High-Salinity Waters