How often does an Australian lungfish surface for air during a dry period?

During a dry period, when water levels drop and oxygen content in the water becomes significantly reduced, the Australian lungfish relies on its primitive lungs to breathe atmospheric air. Under these conditions, the fish surfaces to breathe approximately every 40 to 50 minutes.1

Unlike some other species, the Australian lungfish does not burrow into the mud or undergo estivation during these dry spells. Instead, it remains active in isolated waterholes, transitioning from gill breathing to atmospheric air breathing to survive the low-oxygen environment.21