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An Investigation of a Disease of the Fresh Water Fish Ctenopharyngodon Idellus and Its Chemotherapeutical Control

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Fourteen species of bacteria were isolated from diseased grass-carps, Ctenopharyngodon idllus. After identification and inoculation tests, one of these bacteria(A-2), Aeromonas punctata Zimmermann, was found to be a pathogen for the grass carp.Aeromones punctata is a gram negative, rod-shaped bacteria, motile by means of a single polar flagellum. It is able to digest gelatin, casein and sulfide, methyl red and acetylmethylcarbinol tests. It ferments most carbohydrates with the production of acid and gas.Aeromonas punctata is sensitive to many kinds of antibiotics and sulfonamides, but chloramphenicol was found to be the most efficient antibiotic in controlling this pathogen.

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