Asian Water Dragon Care Guide
Physignathus cocincinus
Asian water dragons — also known as green water dragons, Thai water dragons, or Chinese water dragons — originate from southeastern Asia, with a native range including Thailand, southern China, Vietnam, and Cambodia. Purchasing captive-bred individuals is highly recommended, as they are more acclimated to captivity, more docile, and typically healthier than wild-caught specimens.
Males are larger than females and can reach lengths of 3 feet, while adult females typically grow to about 2 feet. Males develop jowls, larger femoral pores, and a higher nuchal crest as they mature. While beautiful, these semi-arboreal lizards have specific care requirements that can make them more challenging to keep in captivity. With proper care, Asian water dragons can live 10–15 years.
Enclosure
Asian water dragons are arboreal lizards that climb and prefer to be up high. They require tall, large enclosures to facilitate normal climbing, thermoregulation, and exercise, and to limit snout rubbing. An ideal adult enclosure should measure 6 ft tall × 3–4 ft deep × 6 ft long.
Water dragons often do not understand glass and frequently rub their snouts on glass walls, permanently damaging their noses and lower jaws. A large screen enclosure is a good alternative. If using a glass enclosure, taping a visual barrier (such as paper or cardboard) around the outside bottom can help reduce snout rubbing. Larger enclosures also seem to reduce this behavior.
Solitary housing is recommended, though one male can sometimes be housed with multiple females in a much larger enclosure.
Enrichment items can include logs, sturdy branches and shelves for climbing, thick vines, cork hollows, and artificial or live nontoxic plants. Provide an elevated basking branch within 12–18 inches of the UVB bulb and heating element.
Substrate
Cypress mulch, coconut fiber, and sphagnum moss work well as humidity-retaining substrates. Always offer food in a bowl to prevent accidental substrate ingestion, which can lead to intestinal blockage.
Temperature
- Daytime ambient: 84–88°F
- Basking area: 95–100°F
- Nighttime: 75–80°F
Provide heat using a basking bulb or ceramic heat emitter. Lightless heat sources (ceramic heat emitter or radiant heat panel) are needed at night. Monitor temperatures on both ends of the enclosure with a digital probe thermometer or infrared laser thermometer. A reptile thermostat is recommended for safer, more accurate temperature control. Heat rocks should be avoided — they pose a serious risk of severe burns. Temperatures that are too cold frequently result in disease.
Humidity
Maintain humidity at 60–80%, measured with a digital hygrometer. Humidity can be maintained through hand or pressure misting twice daily, humidity-retaining substrates, or an automated misting/fogging system.
Provide fresh, clean water in a large pool big enough for your dragon to fully submerge — water dragons are proficient swimmers. Change and disinfect the pool frequently; larger pools should have an aquarium filter to help maintain water quality. Captive water dragons without pool access or inadequate humidity suffer from dehydration that can lead to kidney disease and difficulty shedding.
UVB Lighting
Artificial UVB lighting is required for water dragons housed indoors. Zoo Med or Arcadia brand UVB bulbs are recommended, such as the ReptiSun 10.0 or Arcadia Desert 12%. Ensure your reptile can get within 12–18″ of the bulb. Dense screening can block up to 50% of UVB — multiple bulbs may be needed for enclosures with very dense screens.
UVB lighting should be on for 12 hours per day (a timer is recommended), with no lighting at night to maintain a proper 12-hour day/night cycle. Replace UVB bulbs every 6–12 months — the UVB-emitting coating wears off even when the bulb still produces visible light.
Diet & Feeding
Asian water dragons are primarily insectivores but will also eat some vegetables and fruits. Variety is essential — avoid offering the same food items repeatedly.
Protein sources: crickets, mealworms, superworms, waxworms, silkworms, earthworms, red wigglers, grasshoppers, butterworms, locusts, feeder fish, pinkies, fuzzies, and whole prey options such as Reptilinks.
Vegetables (offer finely shredded, three times weekly): kale, romaine, collard greens, dandelion greens, bok choy, mustard greens, and squash.
Fruit (occasional treat only, no more than 5% of the diet): mango, raspberries, figs, papaya, cantaloupe, strawberries, and blueberries.
Insect size should not exceed the width between the dragon’s eyes.
- Hatchlings: as many insects as they will eat daily
- Juveniles: insects every other day
- Adults: insects every 3–5 days, rotating with salads on non-protein days
Supplementation:
- Calcium carbonate (without D3) — e.g., Zoo Med ReptiCal — sprinkled on food 2–3 times weekly
- Multivitamin containing true vitamin A — e.g., Zoo Med Reptivite — once weekly. If housed indoors, use Reptivite with D3
Veterinary Care
An annual wellness examination and fecal screening for parasites is recommended for all reptiles.
