Antibacterial potential of Streptomyces and Bacillus isolated from the Madeira and Purus rivers against Aeromonas spp. isolated from tambaqui

This work aimed to test isolates of the genus Bacillus and Streptomyces collected in the Madeira and Purus rivers against bacteria of the genus Aeromonas isolated from tambaqui (Colossoma macropomum). Eleven isolates of Bacillus spp. and 10 from Streptomyces spp. were used against 26 isolates of Aeromonas spp. of tambaquis. To carry out the test, an adaptation of the disk-diffusion method was used, where the antibiotic disks are replaced by agar blocks, with the inhibition promoting bacteria with evident growth, placed in direct contact with the pathogenic bacteria, also sown in board. In the results, inhibition halos were obtained in all 26 isolates of Aeromonas spp.. Nine strains of Bacillus spp. and six strains of the genus Streptomyces spp. showed inhibitory activity. The tests achieved the objective of the research, revealing greater activity and frequency of inhibition of Aeromonas spp. with the use of the genus Bacillus spp. in vitro, serving as a basis for future in vivo applications in order to obtain alternatives for the control of aeromonosis in fish farming.