Infectious stomatitis in axolotls
Infectious stomatitis is an inflammation of the axolotl's mouth, most often caused by opportunistic bacteria. It affects the gums, roof of the mouth, and sometimes the tongue. This condition is common in axolotls kept in poor water quality...
What is it?
Infectious stomatitis is an inflammation of the axolotl's mouth, most often caused by opportunistic bacteria. It affects the gums, roof of the mouth, and sometimes the tongue. This condition is common in axolotls kept in poor water quality or after an injury to the mouth. Without treatment, it can spread and severely compromise the animal's health.
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 axolotl displays redness or small whitish sores inside the mouth. Swelling of the gums or lips is often observed. The animal refuses food or eats with difficulty, sometimes spitting out prey. Excessive salivation or mucus may appear around the mouth. In advanced cases, an unusual odor or whitish deposits resembling cotton (secondary fungal infection) may be visible. The animal becomes lethargic and remains motionless at the bottom of the tank.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is mainly caused by opportunistic bacteria (particularly gram-negative bacteria such as Aeromonas or Pseudomonas) that take advantage of a wound or stress to infect the mouth lining. An injury from feeding, a bite from another axolotl, or an abrasive object in the tank can create the initial point of entry.
Poor water quality (high levels of ammonia, nitrites, or nitrates) is the main risk factor, as it weakens the natural defenses of the skin and mucous membranes. Living with other axolotls increases the risk of bites, particularly during feeding. Chronic stress from unsuitable water temperature, lack of hiding places, or excessive handling also weakens the animal. Feeding on prey that is too hard or aggressive live prey can also injure the mouth.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian specializing in exotic animals examines the axolotl's mouth and assesses the animal's general condition. A sample of the lesions may be taken to identify the responsible bacterium and guide treatment selection. Water quality assessment (ammonia, nitrites, nitrates, pH, temperature) is systematically recommended because it is often part of the cause. In some cases, more thorough examination may be proposed if the infection does not respond to initial treatment.
Treatment
Treatment is based on antibiotic therapy appropriate for the species, prescribed by the veterinarian, combined with immediate improvement in water quality. Medicated baths or topical applications may be recommended depending on severity. In case of secondary fungal infection, antifungal treatment may be added. Rest in clean water at the correct temperature and without stress promotes healing.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Maintaining clean, well-filtered water with stable parameters (cool temperature, ammonia and nitrites at zero) is the essential preventive measure. It is recommended to avoid overcrowding and to separate axolotls that tend to bite each other. Feeding with prey appropriately sized for the mouth and avoiding sharp or abrasive decorative elements limits injuries. Regular water changes and quarantine of new animals before introduction are also advised.
Possible complications
An untreated infection can spread to the jaw bone or lead to generalized septicemia, potentially fatal. Prolonged difficulty feeding can result in severe weight loss and general weakening of the animal, making it more vulnerable to other diseases.
When to see a veterinarian
The axolotl refuses to eat for several days.
Lesions, redness or whitish deposits are visible in the mouth.
The animal appears lethargic or remains unusually motionless at the bottom of the tank.
An unusual odor or swelling of the face is noticed.
Prognosis
The prognosis is favorable if the disease is managed early and water quality is corrected alongside treatment. Conversely, delayed diagnosis or infection spreading to deep tissues significantly worsens the prognosis.
Frequently asked questions
Is axolotl stomatitis contagious to other axolotls in the tank?
The bacteria responsible are often already present in the aquatic environment. The risk of direct transmission exists mainly if the animals bite each other, but the primary factor remains the quality of the shared water.
Can I treat my axolotl myself with products bought from a pet store?
It is not recommended to use treatments without veterinary advice, as incorrect dosing or an unsuitable medication can be toxic to the axolotl. Professional advice makes it possible to choose the safest and most effective treatment.
How can I tell if the water in my tank is to blame?
A water test measuring ammonia, nitrites, nitrates, and pH makes it possible to check whether parameters are correct. Any abnormality must be corrected quickly, alongside treatment of the axolotl.
Can my axolotl continue eating during treatment?
If oral pain is severe, the animal may refuse all food for several days. The veterinarian may recommend soft, easy-to-swallow prey to help it feed during recovery.
References
AVMA — American Veterinary Medical Association
Content reviewed by the TunisieVet editorial team · Updated 28 August 2026
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