The susceptibility of Aeromonas salmonicida strains isolated in cultured and wild salmonids to various chemotherapeutics.

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Abstract
One hundred and seventy-five strains of Aeromons salmonicida isolated in cultured salmonid fish and wild salmonid fish from rivers in Japan from 1979 to 1981 were tested for theri susceptibility to 12 chemotherapeutics. Five of 129 (3.9%) strains isolated in the cultured fish were sensitive to all the drugs tested. The remaining 124 strains were resistant to from one to six drugs; in particular, nalidixic acid derivatives and/or nitrofuran derivatives. Transferable R plasmids were detected in only 2 out of the 124 resistant strains. The resistant marker of the detected R plasmids determined as a combination of chloramphenicol (CM), streptomycin and sulfonamides (SA). The molecular weight of the R plasmids was 29M daltons. Non-transferable R plasmids resistant to TC were detected in two A. salmonicida strains habouring transferable R plasmid and had a molecular weight of 7.6M daltons. On the other hand, 32 strains (69.6%) isolated in wild salmonid fish were sensitive to all the drugs tested. The remaining strains were resistant to SA, and to a combination of CM, colistin and SA. These resistant strains had no transferable R plasmids.

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