
Veterinarian Faye Bethell, who performed the 50-minute operation assisted by two veterinary nurses, had to bubble anaesthetic through the water in an operating tank to knock out the 7-centimetre fish.
"At the end of the day, they're all pets and everybody does have a commitment to their pet," Bethell, who runs the Toll Barn Veterinary Centre in North Walsham, Norfolk, told the BBC.
A "lump" blocking the fish's bottom caused the constipation.
"Obviously we discussed all the options and he made the decision to go for surgery."