Popeye (Exophthalmia): symptoms, treatment, prevention
Popeye (exophthalmia) is a protrusion of one or both eyes caused by fluid build-up, usually following trauma or bacterial septicemia.
Overview
Popeye, or exophthalmia, is a clinical sign rather than a specific disease: fluid accumulates behind the eye and pushes it outward. Bilateral involvement usually indicates systemic bacterial disease or osmotic imbalance; unilateral involvement is more often local trauma or infection.
Symptoms
- One or both eyes bulging
- Cloudy cornea in some cases
- Loss of color
- Lethargy when systemic
- Anorexia in advanced cases
- Possible permanent eye damage if delayed
Causes
Mechanical injury from decor or aggressive tankmates, poor water quality, bacterial septicemia and osmotic imbalance are the main causes; chronic stress lowers the threshold.
Diagnosis
Unilateral popeye after a known incident points to trauma; bilateral popeye with other systemic signs (lethargy, fin clamping, color loss) points to bacterial septicemia. Check water parameters first because elevated nitrate often triggers chronic mild popeye.
Treatment
Combine osmotic relief with an antibiotic course and correct the underlying water quality or trauma source.
Quarantine
Move the fish to a hospital tank with stable parameters and gentle flow. Remove any sharp decor from the original tank before returning the fish.
Medication
- Magnesium sulfate (Epsom salt) at about 1 tablespoon per 20 litres in the hospital tank as an osmotic diuretic.
- Kanamycin sulfate or erythromycin in food or water for 7-10 days; address underlying water quality and stress.
Recovery
Eyes often shrink back over weeks if treated early; chronic cases can leave permanent damage. Continue good water quality and reduce aggression in the tank.
Prevention
- Maintain good water quality
- Avoid sharp decor
- Minimise tankmate aggression
- Avoid unnecessary handling stress