الفهرس 
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Abstract
Bacterial diseases affecting fresh water fishes are numerous causing high economic losses in Egypt, therefore, this study was conducted for six main goals: isolation and identification of bacterial isolates affecting cultured freshwater fishes as well as the incidence of these diseases in Kafr El-Sheikh Governorate, confirmation by PCR, performance of pathogenicity test, Antibiotic sensitivity test & Hydrochemical anlysis for water quality.
180 cultured freshwater fishes (120 Oreochromius niloticus & 60 Cyprinus carpio) were collected from both private and governmental farms in Kafr El-sheikh Governorate.
The most common clinical signs were congestion and haemorrhages on body surface and base of fins. Post-mortem findings revealed pale anaemic liver in some cases and in other cases, liver were haemorrhagic and congested. Kidney and spleen were enlarged and congested.
80 bacterial isolates from all naturally examined fish species were obtained (46 Oreochromius niloticus isolates from & 3460Cyprinus carpio) isolates from).
Biochemical identification of these isolates revealed 12 bacterial serotypes; Aeromonas hydrophila, Pseudomonas spp., Edwaradsiella spp., Yersinia ruckeri, Proteus ssp., Provedencia rettegri, Citrobacter freundii, Alkaligene faecalis, Klebsiella pneumonia, Flavobacterium columnare, Streptococcus spp. and Enterococcus faecalis.
Water quality analysis poses ahazard to human’s health as human contact with and consumption of fishes.