Australian lungfish

The Australian lungfish (Neoceratodus forsteri) is a large, olive-green to dull brown fish found in Australian rivers. It is the oldest living fish species, with some individuals in aquariums exceeding 80 years old. This fish is unique among lungfish as it possesses only one functional lung, unlike its African and South American relatives which have two.12

Lungfish belong to the subclass Dipnoi and are characterized by their ability to breathe air using lungs, in addition to gills. They first appeared in the Early Devonian period, over 400 million years ago. While most lungfish species are found in Africa and South America, the Australian lungfish is endemic to a small region in Queensland, Australia.2

Economically, lungfish have minor importance, being consumed as food in some parts of Africa and South America. The Australian lungfish, however, is not typically eaten by humans.2