How to Treat Goldfish Dropsy with Pinecone Scales: Complete Medication Guide
Problem
My goldfish has pinecone scales and a bloated stomach. I tried oxytetracycline (土黄素) baths for several days, but the fish shows no improvement. What medication should I use, and how should I apply it?
Environment
- Thai lion goldfish (泰狮) with dropsy symptoms
- Previous treatment: oxytetracycline bath (no improvement)
- Fish still active and swimming
- Hospital tank available
What Happened?
I followed some online advice and used oxytetracycline baths. But after several days:
- Fish produced waste (good sign)
- But bloating and pinecone scales remained unchanged
- No visible improvement
I realized I needed a more effective treatment protocol.
How to Solve It?
The community recommended a structured approach with stronger antibiotics. Here’s the protocol I learned:
Treatment Protocol Overview
Day 1-5: Gentamicin immersion + daily water changes ↓Day 3+: If no improvement → Add topical metronidazole ↓Day 5-7: Monitor for reduced swelling ↓Day 7+: If scales return to normal → Gradual recoveryStep-by-Step Treatment
Step 1: Isolate the fish
Use a hospital tank. Treat alone—never in the main tank with other fish.
Step 2: Add salt
Hospital tank size: 20LSalt amount: 60-100g (0.3-0.5% salinity)
Purpose: Reduce fluid retention, ease stressStep 3: Gentamicin treatment (primary method)
Medication: Gentamicin (庆大霉素)Dosage: 2-3ml per 10L waterPreparation strength: 80,000 units
Application: 24-hour immersionWater change: 50% daily, replace medicationDuration: 5 consecutive daysExample for a 20L tank:
- Add 4-6ml gentamicin (80,000 units preparation)
- Leave fish in medicated water for 24 hours
- Next day: drain 50% water (10L), add fresh water + 2-3ml gentamicin
- Repeat for 5 days
Step 4: Furazolidone alternative
If gentamicin isn’t available, use furazolidone (呋喃唑酮):
Medication: Furazolidone (呋喃唑酮)Application: Add directly to waterFollow package dosage instructionsDuration: 5-7 days with daily water changesStep 5: Metronidazole for stubborn cases
If bloating persists after 2-3 days of gentamicin:
Medication: Metronidazole powder (甲硝唑)Method: Apply to swollen belly area with cotton swabWarning: External application only—avoid mouth/gillsStart: Day 3 of treatment, if no improvementFrequency: Once dailyImportant: Do NOT continue feeding
The fish should fast during treatment. Feeding adds digestive stress.
The Reason
I think oxytetracycline didn’t work because:
- Wrong antibiotic choice — Oxytetracycline may not target the specific bacteria causing the infection
- Insufficient dosage — Bath treatments often don’t reach effective concentrations
- No water changes — Medication degrades over time; daily replacement keeps concentration stable
Gentamicin is effective because:
- Targets gram-negative bacteria (common cause of dropsy)
- Works well in water immersion
- Reaches internal organs through absorption
Common Mistakes
| Mistake | Consequence | Correct Approach |
|---|---|---|
| Salt alone | Bacteria survive | Add antibiotics |
| No water changes | Medication loses potency | Change 50% daily |
| Wrong dosage | Treatment ineffective | Follow exact measurements |
| Feeding during treatment | Digestive stress | Fast the fish |
| Treating in main tank | Risk to other fish | Use hospital tank |
Summary
In this post, I showed how to treat goldfish dropsy with specific medications. The key point is using gentamicin (2-3ml per 10L, 80,000 units) with daily 50% water changes for 5 days, or furazolidone as an alternative. For stubborn cases, apply topical metronidazole starting day 3. Isolate the fish, add salt, and stop feeding during treatment.
Final words
More reading and next steps
That is the main thread of the article. Keep the links below handy, and use the related posts to continue exploring the same topic from a different angle.
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