Inadequacy of Aquarium Antibacterial Formulations for the Inhibition of Potential Pathogens of Freshwater Fish

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Abstract
The antibacterial activity of fourteen products marketed for the therapy and prophylaxis of bacterial infections of aquarium fishes was tested. When used at the dilution recommended by the manufacturers, the products failed to inhibit the growth of bacterial species known to be potential pathogens of freshwater fishes and failed to reduce significantly the bacterial numbers in water containing fish. Concentrations of the products that were bacteriostatic, bactericidal, or sporicidal were markedly higher than the recommended concentrations. Use of the products at higher concentrations in aquaria showed two of the products to be inimical to fish.

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