Antibacterial activity of Proteus spp. isolated from the rice-fish farming system cultivation area against A. hydrophila

Proteus spp bacteria is one of the bacteria that have antibacterial activity. Bacteria that produce antibacterial can suppress the growth of pathogenic bacteria such as A. hydrophila. This study aimed to determine the antibacterial activity of several strains of Proteus spp. against A. hydrophila from the rice-fish farming system cultivation area in the Banyumas district. Research stages included isolating bacteria from a sample, preparing the test bacteria, and testing the inhibition power of Proteus spp. in agar-well diffusion dishes. The results showed that the identified Proteus strains included Proteus mirabilis strain MRKMSEC 72 (BA1), Proteus penneri strain CPrp_RA24 (BA3), Proteus mirabilis strain BN7 (BA7), Proteus mirabilis strain BN7 (BU4), and Proteus vulgaris strain Siii (BS11). All strains obtained had an antibacterial activity that could inhibit Aeromonas. It was also found that most Proteus spp. Species are sensitive to antibiotics, especially amoxicillin. Proteus species with high levels of antibiotic sensitivity are expected to be able to fight A. hydrophila in cultivation environments and be used as biocontrol agents.