The world’s oldest aquarium fish has died!

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Grandad, a lungfish that is the longest-living aquarium fish has been put down due to ill health.

The Shedd Aquarium in Chicago said the fish, was euthanised after losing interest in food and showing signs of organ failure.

Granddad, who weighed 11kg (24lbs), had been seen by more than 100 million people since arriving in Chicago from his native Australia in 1933.

Lungfish, which can live to be more than 100 years old and are a protected species in Australia, have existed for nearly 400 million years and fossils show they have remained unchanged for more than 100 million years.

They are native to two rivers in Queensland, have a single primitive lung and are among the few fish that can breathe air.

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