Fantail Goldfish Floating at Surface: Swim Bladder Emergency

Diagnosing the Behavior

A fantail staying at the surface with dorsal fin exposed, unable to submerge, signals positive buoyancy—almost always swim bladder disorder or severe constipation/intestinal blockage. In a gently heated Calgary pond, temperature isn't the trigger.

Immediate Rescue Protocol

1. Move to hospital tank: 20+ gal, cycled sponge filter, heater (match pond temp), aeration.
2. Fast 3 days.
3. Feed peas: Day 4 onward, 2–3 shelled, cooked, mashed peas daily (high fiber).
4. Water quality: Daily 25% changes; 0 ammonia/nitrite.
5. Epsom salt bath: 1 tbsp/gal for 15 min daily if constipation suspected (draws fluid).

Diet Review

What are you feeding? Dry pellets expand in the gut. Soak pellets 1 min before feeding. Include gel foods, frozen bloodworms, brine shrimp, and weekly peas. Avoid overfeeding.

Prognosis

Caught early, fancy goldfish often recover fully. Chronic cases may need permanent diet management. If no improvement in 10 days, consult an aquatic vet—internal tumors or organ failure are possible.