Isolates obtained from aquarium fish and aquarium waters identified as belonging to the Aeromonas hydrophila complex were examined for the presence of R factors imparting conjugal transmissibility of antibiotic resistance to tetracycline and/or sulfa drugs. It was found that 25.5% of the isolates from fish which were resistant to one or more of the screening antibiotics and similarily 14.1% of the isolates from aquarium water carried such R factors. These studies suggest that the prophylactic use of tetracycline may be a predisposing factor in the emergence of R factor-carrying strains of bacteria in aquarium water.
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Shotts et al. (1976) studied this question.