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French fish farmers use a variety of antibiotics to combat bacterial diseases, especially in freshwater salmonid farms, where issues like Rainbow Trout Fry Syndrome (RTFS) and furunculosis are prevalent.?

Some commonly used antibiotics in French aquaculture include:

• Florfenicol:?This is reportedly the most widely used antibiotic in French fish farming, particularly to treat outbreaks of RTFS.
• Flumequine:?Used to treat furunculosis and sporadic outbreaks of enteric redmouth disease.
• Sulfonamides (e.g., sulfadiazine, sulfadimethoxine):?Used to treat various bacterial infections, sometimes combined with other drugs like trimethoprim.
• Oxytetracycline:?Used to control diseases like Aeromonas liquifaciens and Pseudomonas spp.. However, some sources suggest that oxytetracycline may be banned in some EU member states.?

Other antibiotics used less frequently or in specific situations include:

• Oxolinic acid:?Used to treat diseases caused by gram-negative bacteria such as vibriosis, yersiniosis, and furunculosis.
• Amoxicillin:?A β-lactam antibiotic.
• Enrofloxacin:?A fluoroquinolone, although its use to treat?Aeromonas salmonicida?in France may no longer be appropriate due to cost and potential for resistance selection.?