Role of Freshwater Crayfish Procambarus clarkii in Transmission of Motile Aeromonas Septicemia to Nile Tilapia Oreochromis n (one mark)

Document Type : Original Article

Authors

1 Dept.of Fish Diseases and Management, Fac. of Vet. Medicine, Suez Canal Univ.

2 Animal Health Research Institute, Mansoura branch

3 Animal Health Research Institute, Mansoura branch.

Abstract

A total of 60 Nile tilapia fish Oreochromis niloticus were collected from River Nile (Damietta branch): Weesh El-Hagar village during late summer. An experimental infection was applied on apparently healthy Nile tilapia (three equal groups) by intramuscular injection of 0.1 ml of 2.4X107 CFU/ml of well identified A. hydrophila suspension isolated from freshwater crayfish P. clarkii, while, the third group was injected 0.1 ml of sterile buffered saline . The clinical picture, morbidity and mortality rates were recorded for 7 days. The results showed that all injected tilapia died by the end of experiment with a mortality peak on the 3rd day, while the morbidity started to appear by the 2nd day (10%). The histopathological alterations were recorded and discussed. This study suggests an epidemiological significance of Aeromonas hydrophila and the role of crayfish in its transmission.

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Suez Canal Veterinary Medical Journal. SCVMJ
Volume 20, Issue 2
December 2015
Pages 251-260

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