Axolotl Diseases Overview
Axolotls are hardy animals, but they are susceptible to a handful of common health issues — most of which trace back to poor water quality or incorrect temperature. Catching problems early is critical. This guide covers the most common axolotl diseases, how to identify them, and what to do.
1. Fungal Infections
Symptoms
White, fluffy, cotton-like growths on the skin, gills, or limbs. Often starts small and spreads quickly if untreated.
Causes
Poor water quality, physical injury, or stress. Fungal spores are present in most aquariums — they only take hold when the axolotl's immune system is compromised.
Treatment
Salt baths (2–3 teaspoons of non-iodized salt per liter of dechlorinated water for 10–15 minutes) can treat mild cases. Improve water quality immediately and address the root cause. For persistent or severe infections, consult an exotic vet for a proper diagnosis and treatment plan.
2. Bacterial Infections
Symptoms
Red streaking or redness on the skin, open sores, lethargy, loss of appetite, swollen limbs or body.
Causes
Elevated ammonia or nitrite, physical injury, or secondary infection following a fungal outbreak. Aeromonas is the most common bacterial culprit.
Treatment
Improve water quality immediately. Mild cases may resolve with clean water alone. Severe cases require antibiotic treatment — consult an exotic vet for appropriate medication and dosing.
3. Impaction
Symptoms
Swollen or bloated abdomen, lethargy, complete refusal to eat, difficulty moving.
Causes
Ingestion of gravel, coarse substrate, or large food items that can't pass through the digestive tract.
Treatment
A cool water bath (60–64°F) with light movement can sometimes help pass a minor blockage. Supportive care with clean, cool water is appropriate while monitoring closely. Severe impaction requires veterinary intervention. Prevention is the best cure — use fine sand or bare-bottom substrate only. See our Best Fine Sand for Axolotls guide.
4. Gill Deterioration
Symptoms
Gills shrinking, losing their feathery branches, or turning pale. Healthy axolotl gills should be full, bushy, and richly colored.
Causes
Poor water quality, high nitrates, chronic stress, or inadequate oxygenation. Can also occur naturally in older axolotls.
Treatment
Improve water quality, increase oxygenation, and reduce stressors. Gill regrowth is possible in younger axolotls if the underlying cause is addressed promptly.
5. Ammonia Poisoning
Symptoms
Rapid gill movement, lethargy, loss of appetite, red or inflamed skin, floating near the surface.
Causes
Uncycled tank, overfeeding, dead tank mates, or insufficient filtration.
Treatment
Perform an immediate 30–50% water change with dechlorinated water at the correct temperature. Test water daily until ammonia reads 0 ppm. Do not feed until water parameters are stable.
6. Parasites
Symptoms
Scratching behavior, localized redness or irritation, visible abnormalities on the skin or gills, lethargy.
Causes
Introduction of infected live food or plants. Feeder fish are a common vector. Quarantine failures are the most preventable cause.
Treatment
Consult an exotic vet for diagnosis and appropriate antiparasitic treatment. Quarantine any new animals for 30 days before introducing them to the main tank.
Prevention Checklist
- ✅ Keep water between 60–68°F at all times
- ✅ Maintain ammonia and nitrite at 0 ppm
- ✅ Keep nitrates below 20 ppm with weekly water changes
- ✅ Use fine sand or bare-bottom substrate — no gravel
- ✅ Quarantine new animals for 30 days before introduction
- ✅ Avoid feeder fish as a food source
- ✅ Remove uneaten food within an hour