Old Goldfish Dying with Popeye and Red Lesions: Septicemia and Dropsy

Symptoms Decoded

• Popeye (bulging eyes): Usually dropsy (internal organ failure) or bacterial infection.
• Red streaks on fins/eyes: Septicemia—bacteria in the bloodstream from poor water quality, injury, or parasites.
• Scale loss, slime: Stress response and secondary infection.

Immediate Actions

1. Test ammonia, nitrite, pH, KH.
2. 30% water change with dechlorinator.
3. Add pond salt (0.05%).
4. Treat with MelaFix (tea tree oil) or, if severe, a prescription antibiotic (consult a vet).
5. Reduce feeding; increase aeration.

Root Cause

11-year-old goldfish in a possibly overcrowded pond. The biomass may exceed the filter capacity. Consider rehoming some fish or upgrading filtration.

Resource

Koivet.com for detailed disease diagnosis.