Shubunkin with Swollen Abdomen: Dropsy, Constipation, or Tumor?

Symptoms

3-year-old Shubunkin in 400-gal pond: abdomen swollen 2×, not eliminating, floating upside down, not eating. No pineconing (scales not raised).

Differential Diagnosis

• Egg-binding (female): Retained eggs cause swelling; can be fatal if not released.
• Internal tumor/cancer: Common in older fish; no cure.
• Swim bladder disorder: Caused by infection, constipation, or anatomy; leads to floating.
• Constipation/impaction: From poor diet or cold water slowing digestion.

Immediate Steps

1. Isolate in hospital tank with pond water, aeration, heater (75°F).
2. Epsom salt bath: 1 tbsp/gal for 15 min, daily ×3 (reduces swelling, acts as laxative).
3. Feed cooked, shelled peas (fiber) if eating.
4. Antibiotics (e.g., Kanamycin) if bacterial infection suspected.

Prognosis

If egg-binding: may resolve with warmth and Epsom. If tumor: humane euthanasia (clove oil) when quality of life declines. Consult fish vet for ultrasound.