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Nile tilapia farming is one of the most important worldwide. The main pathogenic bacteria of tilapia cultivated in farms in center of the state of Veracruz, Mexico, were identified. The bacteria were isolated from different culture systems, the syndromes shown by the organisms and the quality of the water in the production systems were registered. Eight samplings were carried out from March to May 2022, six organisms with clinical signs of bacterial diseases were sampled from different farms. Seventy-five bacterial strains were identified, from which, fifty were Gram-negative and twenty-five Gram-positive. Twenty-two different genera of bacteria were identified, the most abundant being Streptococcus, Cardiobacterium, Acinetobacter, Streptobacillus, Corynobacterium and Actinobacillus. The syndromes registered in the organisms were mainly: exophthalmia (11.32%), loss of eyes (9.43%), skin lesions such as bruises or ulcers (15.66%), fraying fins (33.96%), detachment of scales (32.07%), ascites (22.64%). %). The organs with the highest bacterial load were kidney (84.61%), brain (83.33%), spleen (33.33%) and heart blood (16%). In general, fish hatchlings presented a smaller variety of bacterial genera. Knowledge of the pathogenic bacteria of farmed tilapia will be helpful as the basis for establishing adequate control measures. [ABSTRACT FROM AUTHOR]