STUDIES ON SOME BACTERIAL DISEASES IN SOME CULTURED FRESHWATER FISHES IN KAFR EL-SHEIKH GOVERNORATE

Document Type : Original Article

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Department of Fish Diseases and Management, Faculty of Veterinary Medicine, Kafrelsheikh University

Abstract

Bacterial diseases affecting fresh water fishes are numerous causing high economic losses in Egypt, therefore, this study was conducted for two 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.
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 & 3460 Cyprinus 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.
Results of antibiogram screening that ciprofloxacin is the drug of choice for treatment of Aeromonas hydrophila.

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