Sperm Whales Released Bubbles to Regulate Buoyancy
Researchers tracked how sperm whales manage their vertical resting state using air volume regulation.
Updated on Sept. 21, 2026 in Asthma
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Between 2005 and 2019, researchers discovered that sperm whales release air bubbles to maintain neutral buoyancy while resting vertically underwater. The finding clarifies how these marine mammals stabilize their position during sleep periods lasting up to three hours.
Why it matters
Understanding the physiological mechanics of how whales manage buoyancy helps scientists clarify the complex respiratory and movement adaptations of these large marine mammals. These findings underscore how specific air-volume regulation allows these animals to conserve energy while inactive.
In an observational study of 42 tagged sperm whales monitored between 2005 and 2019, 17 whales were recorded resting vertically. This analysis confirms that whales release air bubbles to counteract upward pressure and maintain a stable resting position.
The details
Sperm whales possess a spermaceti organ filled with waxy oil, which is lighter than water and influences their buoyancy. To remain vertical while resting, they must counteract the upward pressure caused by air trapped in their lungs and respiratory tracts. By releasing air bubbles, they adjust their overall buoyancy to achieve a neutral state that facilitates long, stationary rest periods.
Timeline
Data collection occurred between 2005 and 2019 near Norway's Lofoten Islands.
Health Landscape
This study advances the ongoing research into marine mammal respiratory adaptations by detailing a specific buoyancy control mechanism used during vertical rest. It adds to the growing body of knowledge regarding how large mammals manage extreme physical states through unique biological mechanisms.
While this finding relates to marine biology rather than human health, it illustrates the critical importance of respiratory volume in maintaining physical stability. Researchers emphasize that these complex biological mechanisms are essential for survival in challenging, high-pressure environments.
The takeaway
Sperm whales maintain their vertical resting position by strategically releasing air bubbles to manage their buoyancy. This mechanism highlights the sophisticated ways in which mammals can adjust their respiratory systems to remain stable in their environments.
Further reading
Learn more about the relationship between respiratory function and air volume in our Asthma section.
Source note: This article includes information reported by Mongabay.
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