Koi Pox (Cyprinid Herpesvirus-1)

Symptoms

• White, waxy, or translucent wart-like growths on the skin, fins, or gill covers.

• Lesions are more noticeable in cooler water temperatures (below 68°F/20°C).

• Often non-lethal and may disappear as water warms.

Diagnosis

• Visual identification of characteristic growths.

• Affected koi typically exhibit normal behavior and appetite.

• Confirm by ruling out other causes, like fungal infections or lymphocystis.

Causes

• Viral infection common in koi, especially juveniles.

• Stress or poor water quality can trigger outbreaks.

• Low water temperatures encourage symptom manifestation.

Treatment

• No direct treatment; koi pox is a viral condition that resolves on its own as temperatures rise.

• Maintain optimal water quality and reduce stress.

• Ensure water temperatures gradually increase above 68°F/20°C when feasible.

Prevention

• Quarantine new fish for 2-4 weeks before adding to the pond.

• Avoid sudden temperature fluctuations.

• Provide a balanced diet and low-stress environment to strengthen immune systems.

Bio Filter Impact

• No impact; koi pox is not treated with chemicals that harm beneficial bacteria.

Additional Notes

• Koi pox is primarily a cosmetic issue and rarely affects fish health long-term.

• Avoid unnecessary handling to prevent stress during outbreaks.