| − | '''Quaternary ammonium compounds''' can be delivered in a static bah or flow through system for infected adult fish and fry. '''Potassium permanganate''', copper sulphate and hydrogen peroxide can be applied externally but they can be toxic at high concentrations. | + | '''Quaternary ammonium compounds''' can be delivered in a static bath or flow through system for infected adult fish and fry. '''Potassium permanganate''', copper sulphate and hydrogen peroxide can be applied externally but they can be toxic at high concentrations. |
| − | '''Terramycin''' can be added to feed as an alternative for adults, fry and broodstock. This can also be used preventively. Some resistance is emerging however. | + | '''Terramycin''' can be added to feed as an alternative for adults, fry and broodstock. This can also be used preventively. Some resistance is emerging however. |