Chinese Water Dragon

Overview

Chinese (Asian or green) water dragons are striking green lizards with banded tails ¹². Once settled, they are generally tame and rarely aggressive to people. A frightened one may gape, tail-whip or bolt ¹. Adult males reach about three feet, females about two, and more than half of that is tail ¹². They live ten to fifteen years ¹².

The catch is housing. They need a very large, tall, humid enclosure with a pool, and the many inexpensive wild-caught imports often arrive stressed and sick ¹².

Natural history

Water dragons come from mainland Southeast Asia, including Thailand, southern China, Vietnam and Cambodia ¹³. They climb, bask on branches over water, and swim ¹². Color is brightest in the breeding season ².

Enclosure

• Size. Tree of Life recommends 6 ft tall × 3–4 ft deep × 4–6 ft long for one or more adults ¹. LafeberVet gives a 75-gallon terrarium as the bare minimum, and 6 × 3 × 7 ft for one to three lizards ².
• Glass and snouts. Water dragons don't understand glass. They rub or crash their snouts into it and can permanently damage nose and jaw. Large screen enclosures, or a visual barrier taped around the bottom of glass, help ¹.
• Climbing and cover. High basking branches and shelves, with dense live or artificial plants (pothos, philodendron, ficus, hibiscus, dracaena) ¹.
• Pool. A large pan for soaking and swimming. Clean unfiltered water daily, and change filtered pools every three to four days ¹².
• Groups. They can be kept alone, in pairs or in trios with plenty of hides, but they sometimes fight among themselves ¹².

Temperature & lighting

Use incandescent basking lights during the day and a lightless source such as a ceramic heater at night, both on a thermostat ¹. Use at least two digital thermometers ¹.

UVB is required. Without it, water dragons develop metabolic bone disease, which can lead to bent or broken bones, tremors, seizures and death ¹. Use a fluorescent or mercury vapor UVB lamp on a timer that follows natural day length ¹. Unfiltered sunlight in a shaded outdoor cage is excellent. Never put a glass tank in direct sun, which can overheat and kill the lizard ¹.

Humidity

Keep humidity close to 80%, within a 60 to 90% range ¹². Closed-top enclosures hold humidity best, but keep some ventilation to prevent mold ¹. Moving water from a bubbler or waterfall, live plants, moist substrate and once- or twice-daily misting all help ¹.

Substrate

Cypress mulch holds humidity, allows digging and cushions falls. Sphagnum moss also works ¹. Coconut-husk substrates may irritate water dragons' eyes ¹. Feed from a bowl so mulch is not swallowed with food ¹.

Diet & supplementation

Water dragons are mostly insect-eaters that become more omnivorous with age ¹².

• Insects. Crickets, roaches, king mealworms, silkworms, earthworms, grasshoppers and locusts. Vary the menu to prevent boredom and picky eating ¹².
• Whole prey. Feeder fish and pinky or fuzzy mice two or three times a week help build bone in growing and adult dragons ¹.
• Plants. Finely shredded greens (kale, romaine, mustard greens), squash and small chunks of fruit ¹².
• How often. Juveniles daily, adults once or twice a week, or more if they are active in a large enclosure ².
• Supplements. Tree of Life recommends calcium most days and a multivitamin with true vitamin A once a week, to prevent eye, mouth and breathing problems ¹. Ask your vet for a schedule.

Handling & temperament

Once used to you, most water dragons tolerate handling well ¹. Startled ones may still dash away, darken or hide in their water ¹. Wash your hands after handling: reptiles can carry Salmonella ⁵.

Health

Common issues

• Snout and jaw injuries from rubbing or crashing into glass ¹.
• Intestinal parasites in wild-caught animals, which may need repeated treatment ¹.
• Metabolic bone disease without UVB and calcium ¹.
• Weak immunity and poor digestion when temperatures are wrong ¹.
• Gut blockage from swallowed substrate ¹.
• Eye, mouth and breathing problems linked to vitamin A deficiency ¹.

When to see a vet

Have every new water dragon checked for parasites ¹. See an exotic-animal vet for snout wounds, appetite loss lasting more than a week, tremors, noisy breathing or stuck shed. Tremors or seizures can signal advanced metabolic bone disease ¹. Open-mouth breathing, limp or oddly angled limbs, large open wounds or an unresponsive animal are emergencies ⁶.

Breeding overview

Water dragons reach maturity at around two to three years, once longer than about 16 inches ². Females lay eggs ³.

Legal & ethics

Physignathus cocincinus is listed on CITES Appendix II ⁴. Most water dragons for sale are wild-caught imports, which often carry heavy parasite loads and face injuries ¹². Captive-bred babies cost more but are much healthier, which more than offsets the price ¹. Choose captive-bred.

Sources

1. Chinese Water Dragon Care · Tree of Life Exotic Pet Medical Center
2. Basic Information Sheet: Chinese or Green Water Dragons · LafeberVet
3. Physignathus cocincinus · The Reptile Database
4. CITES listing: Physignathus cocincinus · Species+ (UNEP-WCMC and CITES Secretariat)
5. Salmonella, Feeder Rodents, and Pet Reptiles and Amphibians · U.S. Food and Drug Administration
6. When Should My Reptile See a Veterinarian? · Tree of Life Exotic Pet Medical Center

Last reviewed 2026-10-24 by Novel Fauna. This guide is general husbandry information, not veterinary advice. When an animal is sick, see a veterinarian experienced with exotic animals.

Revision history

1. 2026-10-24 Library: 50 cited care guides, /library/[slug] route, coming-soon cards, SLUGS.txt synced to species.guide_slug 228ce54
2. 2026-10-24 WIP: library guides (lizards) 478b100

Evidence grades: Novel Fauna editorial: source classification, not yet expert-reviewed, 2026-10-25. What the grades mean.

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