Depending on the nature of the fish's environment, they are susceptible to many pathogens, including bacterial causes, so the goals of the current study are isolation and molecular identification of Pseudomonas aeruginosa with its prevalence rate and detected virulence genes from fresh common carp fish. The swabs were taken from the gills, skin, intestine and muscles of 75 fish samples from variable localities from Mosul city during the period September to December in the year 2021. The prevalence percentage of bacteria was 26.66% which was confirmed by traditional microbiological tests which included (phenotype culture, microscopically features and API-test) and molecular identification. The isolates formed 42.5, 37.5, 15, 5% from gills, skin, intestine and muscles, respectively. The molecular results of forty isolates determine that Pseudomonas aeruginosa have rpoB 100%, and virulence genes oprL, toxA, and algD, which are express the outer membrane protein, exotoxin A and alginate respectively occur as 97.5% for the oprL gene and 100% of both toxA and algD genes.