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Chicago aquarium euthanizes more-than-90-year-old lungfish

Published:Tuesday | February 7, 2017 | 12:03 AM
An Australian lungfish, named Granddad, is seen on display at Chicago's Shedd Aquarium.


An Australian lungfish that entranced visitors to Chicago's Shedd Aquarium for more than 80 years has been euthanised due to old age, the popular tourist attraction announced yesterday.

Granddad, who was four feet long and who weighed 25 pounds, had stopped eating and started showing signs of organ failure.

He was euthanised on Sunday. A necropsy - or animal autopsy - found conditions consistent with old age, aquarium officials said.

"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," said Bridget C. Coughlin, Shedd Aquarium's president and chief executive officer.

Shedd estimates that Granddad was more than 90 years old. The aquarium acquired him from the Sydney Aquarium in Australia during a 1933 collecting expedition, and Granddad was one of two lungfish that attracted visitors during that year's A Century of Progress International Exposition in Chicago.

Aquarium officials estimate that more than 104 million people saw Granddad over eight decades.

"Granddad lived a pretty relaxed life, enjoyed interactions with us, including gentle pats along his back, and loved to eat his leafy greens," said Michelle Sattler, who was Granddad's caretaker for more than 30 years.

Lungfish can live up to 100 years and are a protected species in Australia. The species has existed for more than 380 million years and has not changed for 100 million years, according to the aquarium. Lungfish, as the name suggests, can breathe air. The fish was euthanised with an overdose quantity of anaesthetic that was added to his tank.