INHIBITORY ACTIVITY OF LACTIC ACID BACTERIA ISOLATED FROM TILAPIA GUT AGAINST STREPTOCOCCUS AGALACTIAE | ||||
| Assiut Veterinary Medical Journal | ||||
| Article 12, Volume 70, Issue 181, April 2024, Page 133-145 PDF (996.85 K) | ||||
| Document Type: Research article | ||||
| DOI: 10.21608/avmj.2024.264162.1224 | ||||
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| Authors | ||||
NOURA KELANY   1; SABER KOTB2; HOSNIA ABDEL-MOHSEIN2; ABD EL-MOEZ ISMAIL2
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| 1Department of Animal, Poultry Hygiene and Environmental Sanitation, Faculty of Veterinary Medicine, Assiut University, 71526 Egypt | ||||
| 2Department of Animal, Poultry Hygiene and Environmental Sanitation, Faculty of Veterinary Medicine, Assiut University, 71526 Egypt. | ||||
| Abstract | ||||
| Tilapia culture offers cheap high-quality protein for the human population demand. However, with intensification, the cultured tilapia become threatened by Streptococcus infection, and antibiotic resistance emergence in aquaculture. Therefore, probiotics were investigated to be used as an alternative for antibiotics to treat Streptococcus infections. In the current study, probiotic lactic acid bacteria count ranged from 5.67 to 5.78 log10 CFU/g of tilapia gut microflora. The conventional biochemical tests were carried out for the lactic acid bacteria isolates identification. Only seven native isolates which exhibited inhibitory properties against Streptococcus agalactiae with an inhibition zone 26-50 mm in diameter were selected for characterization. All probiotic isolates were negative for hemolysis and produced both amylase and lipase enzymes. The selected strains tolerated the fish's gastrointestinal acidic and bile conditions. The promising features of the isolated strains indicate that probiotic bacteria of aquatic origin can be considered a safe alternative for pathogen control. | ||||
| Keywords | ||||
| Probiotics; Nile tilapia; lactic acid bacteria; inhibitory activity; enzyme production | ||||
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