Crested Gecko Not Eating

A crested gecko (Correlophus ciliatus) that refuses food is a common concern for reptile owners. Anorexia in these arboreal lizards can stem from husbandry errors, environmental stress, or underlying disease. Because crested geckos have a relatively high metabolic rate and limited energy reserves, prolonged anorexia can quickly lead to weight loss, dehydration, and metabolic complications. This article provides a structured, evidence-based approach to diagnosing and managing inappetence in crested geckos, drawing on guidelines from the Association of Reptilian and Amphibian Veterinarians (ARAV), the Merck Veterinary Manual, VCA Animal Hospitals, and ReptiFiles evidence-based husbandry guides. Both American and Commonwealth spellings (e.g., behavior/behaviour, diarrhea/diarrhoea) are used to serve a global audience.

Quick Q&A

Question: Why is my crested gecko not eating?

Answer: The most common causes are suboptimal temperature or humidity, stress from improper enclosure setup, dietary monotony or spoiled food, and underlying illness such as parasitic infection or metabolic bone disease. Always first check environmental parameters with a digital thermometer and hygrometer, then assess the gecko's body condition and behaviour before consulting an exotic veterinarian.

Understanding Normal Feeding Behaviour in Crested Geckos

Crested geckos are nocturnal omnivores. In the wild, they consume a mix of fruit, nectar, and small invertebrates. In captivity, most owners feed a commercial powdered diet (e.g., Repashy, Pangea) supplemented with live insects such as crickets or dubia roaches. Juveniles feed daily; adults may eat every other day. A healthy gecko will actively lick food from a dish, show interest in prey items, and maintain a rounded tail base (a key fat storage site). A sudden or gradual refusal of food for more than 7 days in adults or 3 days in juveniles warrants investigation.

Step 1: Environmental Checks (Temperature and Humidity)

Improper temperature and humidity are the most frequent husbandry errors causing anorexia. Crested geckos are ectothermic and require a thermal gradient to regulate digestion and metabolism.

Temperature

• Optimal range: Ambient daytime temperature 72–78°F (22–26°C); a basking spot of 80–82°F (27–28°C) is acceptable but not mandatory. Nighttime drops to 65–72°F (18–22°C) are natural.
• Too cold: Below 68°F (20°C) slows metabolism, leading to reduced appetite and incomplete digestion. Chronic cold exposure can cause regurgitation and immune suppression.
• Too hot: Above 85°F (29°C) causes heat stress, dehydration, and anorexia. Crested geckos are prone to overheating because they lack a defined heat source in their natural cloud forest habitat.

Action: Use a digital thermometer with a probe placed at the gecko’s level. Avoid stick-on analog gauges, which are inaccurate. If the temperature is outside the range, adjust the heating source (low-wattage ceramic heat emitter or under-tank heater on a thermostat) and allow 24–48 hours for the gecko to acclimate.

Humidity

• Optimal range: 60–80% relative humidity, with spikes to 90% after misting. Crested geckos absorb moisture through their skin and drink water droplets from leaves.
• Too low: Below 50% leads to dehydration, difficulty shedding, and reduced appetite. Dehydrated geckos may refuse food because they cannot produce enough saliva to swallow.
• Too high: Persistent humidity above 90% without adequate ventilation encourages bacterial and fungal infections, which can cause secondary anorexia.

Action: Measure humidity with a digital hygrometer. Mist the enclosure twice daily with dechlorinated water to create droplets. Provide a humid hide (e.g., a small plastic container with damp sphagnum moss) to allow the gecko to regulate its own moisture level. If humidity is chronically low, increase misting frequency or use a reptile fogger.

Photoperiod

Crested geckos need a consistent day-night cycle. Provide 12–14 hours of light (low-UVB fluorescent or LED) and complete darkness at night. Constant light or irregular photoperiods can disrupt circadian rhythms and feeding behaviour.

Step 2: Diet and Feeding Practices

Even with perfect environmental conditions, diet-related issues are a common cause of anorexia.

Commercial Diet Issues

• Expired or improperly stored food: Powdered diets lose nutritional value and palatability after the expiration date or if exposed to heat and moisture. Always check the manufacturer’s date and store in a cool, dry place.
• Incorrect mixing ratio: Too thick a paste can be difficult for the gecko to lap; too thin may not provide adequate nutrition. Follow package instructions (typically 1 part powder to 2 parts water).
• Flavour fatigue: Some geckos become bored with a single flavour. Rotating between different formulas (e.g., fruit mix, insect mix, growth formula) can stimulate appetite.

Live Prey Issues

• Prey size: Insects should be no larger than the width of the gecko’s head. Oversized prey can cause impaction or fear.
• Prey type: Crickets, dubia roaches, and black soldier fly larvae are suitable. Mealworms and superworms are high in fat and chitin and should be offered sparingly.
• Gut-loading and dusting: Insects must be gut-loaded (fed nutritious food) 24 hours before feeding and dusted with a calcium + vitamin D3 supplement at every feeding for juveniles and every other feeding for adults. Lack of supplementation can lead to metabolic bone disease (MBD), which causes weakness and anorexia.

Food Presentation

• Dish placement: Place food dishes on a stable ledge or platform at the gecko’s typical activity height. Geckos may not descend to the floor to eat if they feel insecure.
• Freshness: Remove uneaten food after 24 hours to prevent spoilage and bacterial growth. Offer fresh food daily.
• Water: Provide a shallow water dish for drinking and mist the enclosure to create drinking droplets. Dehydration is a major cause of anorexia.

Step 3: Stress and Behavioural Factors

Crested geckos are sensitive to stress, which can suppress appetite. Common stressors include:

• Overhandling: Handle only when necessary, and never within 48 hours of a feeding attempt. Frequent handling triggers cortisol release, reducing feeding motivation.
• Enclosure size and complexity: A bare or undersized enclosure causes chronic stress. Minimum size for an adult is 18x18x24 inches (45x45x60 cm). Provide plenty of vertical climbing branches, live or silk plants, and hiding spots.
• Cohabitation: Male crested geckos are territorial and should not be housed together. Females may cohabitate if space is ample, but competition for food can cause subordinate geckos to stop eating.
• New environment: A recently acquired gecko may take 1–2 weeks to acclimate. During this period, minimise disturbance and offer food without expectation.
• Breeding season: Males may reduce food intake during the breeding season (spring to autumn). This is normal if the gecko maintains body weight.

Step 4: Medical Causes of Anorexia

If environmental and dietary factors have been corrected and the gecko still refuses food for more than 7–10 days, a veterinary workup is indicated. Common medical causes include:

Parasitic Infections

Nematodes, coccidia, and flagellates are common in crested geckos. Heavy burdens cause malabsorption, weight loss, and anorexia. A fresh faecal sample should be examined by a veterinarian using faecal flotation and direct smear. Treatment involves appropriate antiparasitics (e.g., fenbendazole for nematodes, ponazuril for coccidia) under veterinary guidance.

Metabolic Bone Disease (MBD)

MBD results from calcium deficiency or improper calcium-to-phosphorus ratio. Early signs include tremors, weakness, and reduced appetite. Advanced MBD causes jaw deformities that make eating painful. Diagnosis is based on physical examination and radiographs. Treatment requires injectable calcium, vitamin D3 supplementation, and UVB lighting correction.

Respiratory Infection

Crested geckos with respiratory infections often show open-mouth breathing, excess mucus, lethargy, and anorexia. Causes include low temperature, high humidity, and poor ventilation. A veterinarian may prescribe antibiotics (e.g., enrofloxacin) after culture and sensitivity testing.

Stomatitis (Mouth Rot)

Infections of the oral cavity cause pain and refusal to eat. Look for redness, swelling, or cheesy exudate around the mouth. Treatment involves debridement, antiseptic rinses, and systemic antibiotics.

Impaction

Ingestion of substrate (e.g., loose coconut fibre, sand) or oversized prey can cause gastrointestinal blockage. Symptoms include anorexia, straining, and a firm abdomen. Radiographs or ultrasound can confirm. Mild cases may resolve with warm soaks and increased hydration; severe cases require surgical intervention.

Reproductive Issues (Females)

Gravid (egg-bearing) females may stop eating before egg laying. If a female is anorexic and has a visibly distended abdomen, she may be egg-bound (dystocia). Dystocia is a medical emergency requiring veterinary intervention (oxytocin, manual extraction, or surgery).

Step 5: When to See an Exotic Veterinarian

A veterinarian experienced in reptile medicine should be consulted if:

• The gecko has not eaten for more than 10 days (adults) or 5 days (juveniles).
• Weight loss is evident: the tail base becomes concave, or the gecko’s spine and ribs are prominent.
• The gecko shows other signs of illness: lethargy, abnormal posture, discharge from eyes or mouth, diarrhoea (or diarrhoea), regurgitation, or laboured breathing.
• Environmental parameters have been verified as correct and dietary changes have been attempted without improvement.
• The gecko is a gravid female that has not laid eggs within 48 hours of expected laying.

What to expect at the vet: The veterinarian will perform a thorough physical examination, assess body condition, and may recommend faecal analysis, blood work, or imaging. Treatment will depend on the underlying cause and may include fluid therapy (oral or subcutaneous), nutritional support (assisted feeding with a syringe), medications, and husbandry corrections.

Prevention: Long-Term Husbandry Best Practices

Preventing anorexia is far easier than treating it. Follow these guidelines from the ARAV and ReptiFiles:

• Enclosure: Use a vertically oriented glass or PVC terrarium with a screen top for ventilation. Provide at least 2–3 hiding spots, live plants (e.g., pothos, bromeliads), and climbing branches.
• Temperature and humidity: Monitor daily with digital instruments. Use a thermostat for any heat source. Mist twice daily; allow the enclosure to dry out slightly between mistings.
• Diet: Offer a rotation of commercial powdered diets (two or three flavours) and live insects 1–2 times per week. Dust insects with calcium + D3 at every feeding for juveniles, every other feeding for adults. Provide a shallow water dish and mist the enclosure.
• Supplementation: Use a reptile multivitamin (without D3 if using UVB) once weekly. Avoid over-supplementation, which can cause toxicity.
• Quarantine: New geckos should be quarantined for 30–90 days in a separate room with separate equipment. Faecal exams are recommended before introduction.
• Regular health checks: Weigh your gecko monthly using a digital gram scale. A healthy adult crested gecko should weigh 35–55 grams. Any weight loss of more than 10% warrants investigation.

Regional Considerations

• United States and Canada: Exotic veterinarians are listed on the ARAV website (arav.org). Many US states require a veterinary license for prescribing reptile medications. The AVMA and AAHA do not have specific reptile guidelines but endorse the ARAV’s standards.
• United Kingdom and Europe: The Federation of Veterinarians of Europe (FVE) and the European College of Zoological Medicine (ECZM) provide specialist referrals. In the UK, the Royal College of Veterinary Surgeons (RCVS) maintains a list of advanced practitioners in exotic medicine. The European Medicines Agency (EMA) regulates reptile medications.
• Australia: The Australian Veterinary Association (AVA) and the Australian and New Zealand College of Veterinary Scientists (ANZCVS) offer specialty certification in reptile medicine. Native crested geckos are not present in Australia, but imported animals are subject to DAFF biosecurity regulations. Australian owners should ensure their gecko was legally imported and has a health certificate.

Summary

A crested gecko that stops eating is a clinical sign, not a diagnosis. The majority of cases resolve with careful evaluation and correction of temperature, humidity, diet, and stress. If husbandry is optimal and anorexia persists beyond 7–10 days, a veterinary examination is essential to rule out parasitic, metabolic, or infectious diseases. By following the systematic approach outlined in this article, owners can quickly identify the cause and restore their gecko’s appetite, ensuring a long and healthy life.

References

[1] Association of Reptilian and Amphibian Veterinarians (ARAV). Basic Husbandry and Medicine of Crested Geckos. Arav.org. Accessed 2025. [2] Merck Veterinary Manual. Exotic and Laboratory Animals: Reptiles. merckvetmanual.com. Accessed 2025. [3] VCA Animal Hospitals. Crested Gecko Care. vcahospitals.com. Accessed 2025. [4] ReptiFiles. Crested Gecko Care Guide: Evidence-Based Husbandry. reptifiles.com. Accessed 2025. [5] Divers, S.J. & Mader, D.R. (2014). Reptile Medicine and Surgery. 2nd ed. Elsevier. (General reptile medicine principles.) [6] Raiti, P. (2012). “Nutritional and Metabolic Diseases in Reptiles.” Journal of Exotic Pet Medicine, 21(3), 224–232. [7] American Veterinary Medical Association (AVMA). Reptile Ownership Guidelines. avma.org. Accessed 2025. [8] Federation of Veterinarians of Europe (FVE). Position on Exotic Pet Medicine. fve.org. Accessed 2025. [9] Australian Veterinary Association (AVA). Reptile Health and Welfare. ava.com.au. Accessed 2025.