Enrofloxacin (Baytril®). A quinolone compound that appears to be safe and effective in fishes. May be used IM, ICe and PO at a dose of 5-10 mg/kg/ Q 48 hours for 7-21 days. May be diluted with sterile saline since the concentrated form (2.27%) may be irritating. May also be used as a bath at a concentration of 2.5 mg/L for 5 hours Q 24 hours. Recent work (Lewbart et al., 2005) indicates 10 mg/kg ICe Q 5 days for koi at 20 degrees C.