Granddad the lungfish – the oldest fish in captivity – euthanised by Chicago aquarium

Granddad, originally from Australia, was in his mid-90s when he began suffering from organ failure

The longest-living fish in a zoological setting, a lungfish known as Granddad acquired by the Shedd Aquarium in Chicago in 1933, has been euthanised after suffering failing health well in his mid-90s.

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 on Monday announcing his death.