Ketoconazole for Fish (Fish Keto)
Quick answerKetoconazole is an azole antifungal that disrupts the fungal cell membrane. It is used for fungal infections of the skin and body. Fungi (not bacteria or parasites).
What ketoconazole is commonly used for
- Confirmed fungal infections
- Fungal growth on wounds or eggs
Things to know
- Many cotton-like growths on fish are actually columnaris, a bacterial infection, not fungus. See our comparison guide before choosing a treatment.
- Not effective against bacteria or parasites.
- Treat in a hospital tank.
How it compares with other options
Ketoconazole is one of several classes of antifungal used by keepers. Our comparison guide lays out which class suits which problem, and our treatment packs combine complementary classes so you have a backup ready.
Products containing ketoconazole
Ketoconazole FAQ
How do I know if it is fungus or columnaris?
True fungus is fluffy and cotton-like and usually starts on damaged tissue or dead eggs. Columnaris is bacterial, often looks like a pale saddle or frayed patch, and spreads quickly. Our guide compares them side by side.
Responsible use. For ornamental aquarium fish only. Not for human use or fish intended for food. Follow the label and consult a veterinarian when unsure.