Goldfish Lying on Side in 1,200-Gal Pond: Sickness or Old Age?

Large goldfish in 1,200-gal pond lies on bottom, swims away when approached, returns to bottom. Other fish fine. Waterfall + spitter + floating heater. Ohio winter. Owner asks if old or sick.

“Hanging” = Illness or Injury

Healthy fish don’t rest on bottom. Likely causes:

• Parasites (flukes, trichodina) → flashing, mucus.
• Bacterial infection → ulcers, popeye.
• Swim bladder disorder → buoyancy loss.
• Water quality → ammonia, nitrite, pH swing.

Steps

1. Test water (ammonia, nitrite, pH, KH).
2. If water OK, net fish for close exam + microscope scrape.
3. Quarantine if parasites/bacteria found.
4. First illness often spreads; act fast.

Age alone doesn’t cause bottom-sitting. Vet or microscopy needed.