Screening and identification of amylase-producing bacteria in tilapia culture system

Fifteen strains of amylase-producing bacteria were screened from dominant bacteria in tilapia culture system, and 9 of them had higher amylase activities (>50.0 U/mL), which were D17, D11, D38, D41, D45, D47, D51, D52 and D55. D51 and D52 had the highest amylase activities in all screened strains, and their amylase activities could be up to 267.86(±29.41) U/mL and 190.52(±42.33) U/mL, respectively. Using 16S rDNA identification, we identified D17 and D11 as Bacillus sp., D45, D51, D41, D47 and D52 as Exiguobacterium sp., D55 as Aeromonas sp., and D38 as Arthrobacter sp..