Bacterial infections that arise naturally in the environment of fish present a major challenge for fish ‎farming in Iraq and globally. The objective of this study was to isolate pathogenic bacteria from ‎common carp that are raised in floating cages and subsequently sold in the local market of Diyala ‎Province. The local examination involved counting 100 fish and collecting samples from them. A ‎dissection was conducted on each fish in the laboratory, isolating bacterial strains from different ‎regions including the skin, gills, liver, spleen, kidney and intestines. Bacteria were ‎identified through microscopic examinations and biochemical tests to pinpoint potential isolates, ‎subsequently confirmed using the API® 20 E system for each strain. ‎ Bacteria isolated from all targeted organs revealed the presence of potential pathogenic species, including Escherichia coli, Aeromonas hydrophila, Pseudomonas aeruginosa, and Staphylococcus spp. In carp from this study, E. coli was found in the highest numbers, particularly in the skin and spleen, while P. aeruginosa and Staphylococcus spp. were detected in lower quantities. The ‎maximum bacterial count in fish organs is found in the skin and spleen (3.27 × 106), while the ‎minimum count is observed in the gills and kidneys (1.91 ± 0.14) ×106. The ‎effect of different antibiotics was illustrated on the isolated bacteria. The antibiotics used include Chloramphenicol ‎‎(C30), Ceftazidime (KF30), Cefoxitin (ZOX30), Ticarcillin (TI30), Oxacillin (OX30), Doxycycline ‎‎(DO20) and Amikacin (AK30). In this research, the pathogenic bacteria impacting the common ‎carp in floating cages within Diyala Governorate, Iraq, were investigated. Sensitivity tests indicated significant resistance ‎rates to commercial broad-spectrum antibiotics, underscoring their prevalence, impact on fish health, and ‎implications for management strategies.‎