Commercial probiotics have bacteria which offer scope for specific treatment as a probiotic against diarrhoea, boosting immune response and relieving stress. Research in probiotics and aquaculture has been done to promote sustainable aquaculture. Studies on microbial ecology in aquaculture and their benefits on human systems are to be assessed. Hence, the present study was aimed at the isolation and characterization of these bacteria obtained from various commercial probiotics. The commercial probiotic samples were collected for isolation using MRS agar. The colonies were selected on the basis of colonial morphology.  Isolates were put through cell morphology, physiology and different biochemical tests. Probiotic sample confirmation was done using 16srRNA molecular technique. MEGA7 was used to conduct phylogenetic evolutionary analysis and tabulate a distance matrix. In results, the isolates manifested non-identical growth patterns at dissimilar conc. of NaCl (2.0,4.0 and 6.5) oxygen and at different temperatures (150C, 300C and 450C). On the basis of sugar utilization, physiological testing, biochemical characterization and genetic identification tests, all isolates were established to different species of Lactobacillus rhamnosus, Pediococcus acidilactici and Lactobacillus Plantarum. A systematic protocol was done to identify, characterize probiotic samples and identify them by genetic analysis. Probiotic use is carefully assessed by regulations

Vibrio parahaemolyticus is the most common species among crustaceans, often causing various diseases and significant losses in aquaculture. Acute hepatopancreatic necrosis disease (AHPND) is a newly emerging shrimp disease that has severely damaged the global shrimp industry. This species of bacteria is associated with gastrointestinal illness in humans and has been implicated in foodborne disease. The present study carried out, isolation and characterization of pathogenic bacterial flora isolated from the infected hepatopancreas of vannamei, obtained from various aquafarms in Andhra Pradesh, India, on 11th June 2018. The collected samples were plated on TCBS- (Thiosulfate-Citrate-Bile salt-Sucrose) agar medium and Hi -Chrome vibrio, as described in Bergey's manual of systematic bacteriology. Isolated colonies were subjected to the following tests- microscopic examination, growth at different temperatures, growth at different NaCl concentrations, and biochemical tests. Further purity, maintenance, and propagation of purified cultures were done. The microbial culture was identified using 16s rRNA molecular technique. Phylogenetic Evolutionary analyses and distance matrix were conducted in MEGA7.In the present study, different samples were screened, a total of three green colonies (V44, V45, V46) were isolated, identified by biochemical tests and genetic identification as Vibrio parahaemolyticus. A systematic methodology has been developed to isolate and characterize Vibrio sp. from diseased shrimp and identify them by genetic analysis