Turtles have lungs and breathe air. Some freshwater species can also absorb dissolved oxygen through specialized tissues, especially in particular environmental conditions. These adaptations vary; they do not make every turtle able to breathe indefinitely underwater.
How turtles breathe air
Turtles take air into their lungs at the surface. An aquatic turtle must be able to reach air safely. Being a strong swimmer is not the same as having gills, and a tank layout should never prevent surfacing.
How long can turtles stay underwater?
The answer depends on species, activity, temperature, and health. Natural observations of sea turtles remaining submerged for long periods do not establish a safe underwater time for a pet. The old universal minute-and-hour table has been removed. Never hold a turtle underwater to test its endurance.
What is cloacal respiration?
Certain freshwater turtles have specialized surfaces associated with the cloaca that can exchange gases with water. Research on the Fitzroy River turtle is an example. This is a species-specific adaptation, not a universal explanation for every turtle’s diving or overwintering.
Cold-season physiology
As ectotherms, turtles’ metabolic demands change with temperature. Some species have remarkable ways to survive low oxygen, including metabolic suppression. Absorbing oxygen and surviving oxygen deprivation are different processes. Painted-turtle research should not be read as a household brumation recipe.
Should a pet turtle brumate?
Seasonal inactivity requires species-appropriate planning and health assessment. Consult a reptile veterinarian before changing temperature, lighting or food to induce it. Do not rub a turtle’s belly to force defecation or copy a short preparation checklist from a general breathing article.
Can turtles drown?
Yes. Air-breathing turtles can drown when trapped or unable to surface. Keep surface access unobstructed, avoid narrow trapping gaps, and provide accessible resting and basking areas. Consider the animal’s size, strength and health when arranging the enclosure.
Explore further
Browse painted turtle guides and red-eared slider guides. For a change in swimming rather than a general biology question, see unusual floating and contact a veterinarian about concerning signs.
Sources and further reading
- NOAA: turtle facts
- University of Queensland: Fitzroy River turtle breathing
- Journal of Experimental Biology: painted turtle physiology
- ARAV: pre-brumation veterinary assessment
