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Abstract:
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Motile aeromonads isolated from the intestines of farm-raised freshwater fish such as Catla catla, Labeo rohita and
Ctenopharyngodon idella have been characterized to species level. Morphological and physiological grouping revealed 61%
Aeromonas hydrophila, 30% Aeromonas caviae, 7% Aeromonas sobria and 2% which remained unidentified. Hemolytic
activity was detected mostly in A. hydrophila, while only half of the A. sobria and A. caviae showed this activity. Antibiotic
resistance patterns of the strains revealed that they had acquired a relatively higher resistance to oxytetracycline, amoxycillin,
ampicillin, novobiocin and polymixin-B, implicating possible use of these antibiotics in the aquaculture systems. |