Abstract: The need for proper identification of bacterial organisms from catfish cannot be overemphasized, hence, it provides update information on emerging and existing organisms thereby enriching the gene bank on fish disease. Catfish samples were collected from Elegbeji, Sanni, Kunle, Johnson, Adewale and Awosanya fish Farms and taken to the Microbiology laboratory, Federal University of Agriculture, Abeokuta, Ogun State for analyses and samples were collected from flesh, gills and intestine were subjected to microbial examination for colonial, Morphological characteristic, Biochemical tests and Molecular tests. Bio Edit was used for importing and mining nucleotides sequences into Gene Bank. The results revealed the following bacterial organisms: fish farms (1 and 2) Staphylococcus aureus, Pseudomonas aeruginosa, Aeromonas veronii, Bacillus subtilis were identified from the skin and Gills while Enterococcus feacium was also identified from the intestines. At farms (3 and 4), the Major bacterial organisms identified from skin, gills and Intestines of the fish were Staphylococcus aureus, Pseudomonas aeruginosa, Aeromonas veronii, Bacillus subtilis while farms (5 and 6) had Enterococcus feacium and Streptococcus agalactiae. The BLAST result is a confirmation of the bio-chemical test earlier carried out with percentage similarity ranging from 78-98% and their accession number, the bacterial organisms identified were Aeromonas veronii, Enterococcus feacium, Pseudomonas aeruginosa, Bacteria subtilis, Staphylococcus aureus, Streptococcus agalactiae. The bacterial organisms were present on the fish but not invasive and only become dangerous if conditions necessary for disease initiation are present such as susceptible host, virulent pathogen and favourable environment are present at the same time. Therefore, preventive medicine is the solution for fish farm management but additional bacterium Aeromonas veronii was detected and need to be added into Nigeria Gene bank data for catfish.
F.A. Awe, A.M. Hammed, O.M. Olarinmoye, F.G. Owodeinde, O.A. Adeboyejo, E.O. Clarke, O.O. Whenu, A.A. Akinyemi, G.N.O. Ezeri, M.O. Bankole and A.O. Olanloye, 2021. Isolation and Characterization of Bacteria from Sub-Adult African Mud Catfish (Clarias gariepinus) from Selected Fish Farms in Ogun State, Nigeria. Journal of Fisheries International, 16: 1-8.