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Diseases of Aquatic Organisms

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DAO 24:71-75 (1996)  -  doi:10.3354/dao024071

High frequency transfer of a broad host range plasmid present in an atypical strain of the fish pathogen Aeromonas salmonicida

Sandaa RA, Enger Ø

We have demonstrated transfer of a naturally occurring plasmid (pRAS1), encoding multiple resistance, from atypical Aeromonas salmonicida strain 718 to a variety of marine bacteria. This plasmid exhibited a broader host range and a generally higher transfer frequency when compared to the promiscuous plasmid RP4 originating from a hospital isolate of Pseudomonas aeruginosa. The plasmid pRAS1 was transferred from A. salmonicida to unrelated bacterial species and even to a Gram-positive bacterium (Lactobacillus sp.). Transfer of the plasmid was also shown to occur between A. salmonicida and 6 different bacterial isolates from fish farm sediments.

Aquaculture . Antibiotic resistance . Promiscuous plasmid

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