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Aeromonas hydrophila SEPTICEMIA IN IMPORTED LIONHEAD GOLDFISH IN IRAN
S.Mehdizadeh Mood and H.Ebrahimzadeh Mousavi
Department of Aquatic Animal Health
Faculty of Veterinary Medicine
Tehran University
Bacterial disease is the most common infectious problem of ornamental fishes, and most bacterial infections are caused by
gram-negative organisms. Extrinsic stressors, including shipping, crowding, poor water quality, and inadequate nutrition, may
predispose an ornamental fish to bacterial disease.
High mortality rate in one of the importing ornamental fish farms in Tehran occured in June 2008. To recognize the reason 50
samples of fishes with clinical sign including anorexia ,Exophthalmia , hyperemia and hemorrhage in skin and fins associated
with fin rot and erosion in some cases were taken to the lab.
In first stage samples were examined for parasite infection and in wet smear 1-3 Gyrodactylus sp. have been observed .but
according to the clinical sign and the high mortality rate , such a light infestation couldn’t be the reason. In necropsy , fluid in
abdominal cavity associated with hyperemia in internal organs and necrosis have been observed that show a bacterial septicemia.
In bacterial culture the bacteria which isolated from the samples was Aeromonas and biochemical results show that the
species is Hydrophila.
Reduction in number of fish per litre ,water exchange and Oxytetracycline (50 to 75 mg/kg of fish for 10 days) which has been
the drug of choice for treating motile aeromonad septicemias in fishes were recommended that lead to considerable reduction
of mortality rate.
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