Oldest captive fish euthanized at US aquarium

The longest-living fish in a zoological setting, a lungfish known as Granddad who was acquired by the Shedd Aquarium in Chicago, Illinois, in 1933, has been euthanized after suffering failing health in his mid-90s, aquarium officials said on Monday.

Granddad, who came to Shedd from Australia in anticipation of the 1933-34 Chicago World's Fair, was seen by more than 104 million people during his time in Chicago, aquarium President Bridget Coughlin said in a statement announcing his death.

"For a fish who spent much of his time imitating a fallen log, he sparked curiosity, excitement and wonder among guests of all ages who would hear his story and learn about the incredible biology that makes his species a living fossil and one of the oldest living vertebrate genera on the planet," Coughlin said.