Manatee heatstroke
Manatee heatstroke is a serious imbalance in body temperature regulation. It occurs when the animal is no longer able to evacuate excess heat, particularly during prolonged exposure to too hot water, a lack of shade, unsuitable transport or...
What is it?
Manatee heatstroke is a serious imbalance in body temperature regulation. It occurs when the animal is no longer able to evacuate excess heat, particularly during prolonged exposure to too hot water, a lack of shade, unsuitable transport or confinement in a poorly regulated pool. It is a vital emergency that affects wild manatees stranded in shallow waters as well as individuals kept in captivity, wildlife parks or care centers.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The animal becomes abnormally despondent and less responsive to stimulation around it.
Its breathing accelerates and may become labored, with straining visible at the nostrils.
Muscle tremors or disordered swimming movements may appear.
The oral mucous membranes may appear pale rather than pink.
In the most severe cases, the animal may exhibit convulsions, loss of coordination or sink into a state of deep prostration, no longer reacting normally to its environment aquatic.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Heat stroke results from an accumulation of body heat greater than the manatee's ability to dissipate it. This can occur during accidental stranding out of water under intense sunlight, being kept in a pool where the water temperature is poorly controlled, prolonged transport in unsuitable conditions, or even during exposure to the open air during veterinary care or too long handling without thermal protection.
Young manatees, weakened, sick or recently rescued individuals are more vulnerable. An environment without access to sufficiently deep or cool water, overheated standing water, lack of shade, poorly ventilated transport, or prolonged handling outside of water increase the risk. Being overweight or having a pre-existing respiratory or cardiac pathology can worsen sensitivity to heat.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian urgently assesses the animal's body temperature as well as its general condition, its breathing and its level of consciousness. Blood tests can be carried out to assess the impact on internal organs, particularly the kidneys and liver. The recent history of the animal, solar exposure, transport, basin conditions, strongly guides the diagnosis.
Treatment
Treatment is based on gradual and controlled cooling of the animal, appropriate rehydration, and support of vital functions under close veterinary supervision. Additional supportive treatment can be implemented depending on the affected organs, including if necessary measures against inflammation or to support kidney function, always decided and administered by a veterinarian.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
It is essential to keep captive manatees in water at a temperature appropriate for the species, with reliable thermal regulation systems that are regularly monitored. During handling or rescue, the time spent out of water must be limited as much as possible and the animal's skin must be protected with damp cloths. During transport, proper ventilation and regular hydration of the skin must be ensured. Careful monitoring during periods of high heat allows any abnormal signs to be quickly detected.
Possible complications
Heatstroke if not treated quickly can lead to internal organ failure, particularly kidney and liver failure, persistent neurological problems, or even death of the animal. Muscle tissue can also be damaged with prolonged exposure.
When to see a veterinarian
The animal exhibits abnormally rapid or labored breathing.
The animal appears unusually despondent, lethargic, or unresponsive.
Tremoring, disordered swimming, or loss of coordination is observed.
The animal has been exposed to high heat, stranding, or prolonged transportation recently.
Convulsions or loss of consciousness occurs.
Prognosis
The prognosis depends on the speed of treatment. Early cooling and rapid veterinary intervention significantly improve the chances of recovery. On the other hand, a delay in treatment or prolonged exposure to heat worsens the prognosis due to possible complications on the internal organs.
Frequently asked questions
Can a manatee get heatstroke while living in water?
Yes. If the water itself is too hot or if the animal remains stranded out of the water under the sun, it can no longer dissipate heat properly, even in an aquatic environment.
What should I do immediately if I discover a stranded manatee in the heat?
You must contact the authorities or a center specializing in aquatic wildlife as quickly as possible, protect the animal from direct sunlight and moisten its skin while waiting for help, without moving it suddenly.
Are captive manatees exposed to this risk?
Yes, particularly if the temperature regulation of the pool is faulty or during transport or prolonged treatment outside the water.
Does heat stroke leave any after-effects?
It depends on the severity and speed of treatment. Renal, hepatic or neurological damage may persist in severe cases.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 30 October 2026
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