| Abstract: |
Aeromonas hyDROPhila was isolated from naturally infected carp, telapias, cat-fish, mullets and fresh water. The organism is characterised by, Gram-negative, rod with rounded end and motile. It grow well on \) nutrient broth incubated at 37 C, nutrient braesculin hydrolysis and produce. proteolytic enzymes.This species of bacteria was also negative with lysineand ornithine decarboxylation, while it gave acid with glucose, lactose, mannitol, salicin, L-arabinose but it did not ferment inositiol. Some strains of Aeromonas hyDROPhila are distinguished by producinggas and acetone from glucose, H2S from cystein, feand L-arginine. These strains of high veriulence to fishand produce colliquation necrosis at the site ofinjection were identefied as Aeromonas hyDROPhila biovar hyDROPhila.The isolates, A. hyDROPhila biovar hyDROPhila were susceptibile to Oxytetracyclin, Tetracyclin, Doxycyclin, Flumequin, Nitrofurantion, Streptomycin.
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