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Antagonistic effects of Pseudomonas fluorescens, P. aeruginosa and P. putida were studied against 12 strains of Aeromonas hydrophila (Ah1-Ah12). Four different fractions of cellular component (i.e. whole cell product, heat killed whole cell product, intra cellular product and extra cellular product) of all Pseudomonas species were equally effective in reducing growth of A. hydrophila strains, as measured by the zone of inhibition in an in vitro sensitivity test and have potential action against A. hydrophila infection in fishes. D

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