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Abstract A total of 305 Mugil spp. (70 Mugil cephalus, 75 Liza carniata, 80 Mugil capito and 80 Liza aurata) were collected randomly and seasonally from lake Timsah at Ismailia governorate from July 2021 till June 2022. They were collected to detect the most prevalent disease problems affecting them. Fish were infected with two Gramnegative bacteria (Vibrio alginolyticus and Enterbactar cloacae) and crustacean parasites (isopods; Renocila sp., Nerocila bivittate and Livoneca redmanii) and copepods; Caligus minimus and Lernanthropus kroyeri). The clinical picture and the histopathological alterations were detected. The total prevalence of parasitic infestations was 42%; the highest for Mugil capito (60%) and the lowest for Mugil cephalus (17.1%). The highest prevalence of bacterial infection was detected in M.capito (67.5%) and the lowest was in Liza carinata (9.3%). The highest intensity was in liver (34.02, 42.3%) while the lowest was in spleen (16.49 and 15.3%) for V. alginolyticus and E. cloacae, respectively. A molecular investigation using PCR for Vibrio alginolyticus was done to confirm its isolation. An experimental trial for T.zillii with the isolated Enterobacter cloacae was also done to confirm the virulence of it using concentrations of (108 ,107 .106 ,105 CFU ml-1 ). Mortality rates, clinical picture and histopathological lesions of the experimentally infected fish were also done. |