Chinese Water Dragon (Physignathus cocincinus) Care Sheet
A complete guide for the successful keeping of this large, semi-arboreal, semi-aquatic lizard, emphasizing the need for vast space, height, and water features.
1. Overview & Commitment
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Common Name: Chinese Water Dragon (CWD), Asian Water Dragon
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Scientific Name: Physignathus cocincinus
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Natural Habitat: Humid, tropical forests and slow-moving, perennial bodies of water in Southeast Asia (Thailand, China, Vietnam). They are strong swimmers and climbers.
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Size: Males reach 60 – 100 cm (2 – 3.3 feet); females are generally smaller. Length is highly dependent on tail size.
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Lifespan: 10 – 15 years in captivity.
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Temperament: Generally docile and curious but can be flighty when young. They are strictly diurnal (daytime active).
2. Vivarium/Enclosure
Water Dragons require a large, tall, and wide enclosure that accommodates both climbing and swimming.
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Minimum Adult Enclosure (Crucial): For a single adult, an enclosure that is at least 1.8 m (6 ft) tall, 1.2 m (4 ft) wide, and 0.6 m (2 ft) deep is the bare minimum. They require significant volume.
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Enclosure Type: Custom-built wooden or PVC enclosures with sealed interiors are best for maintaining the high humidity and handling water spills.
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Structure: Provide thick, sturdy branches and horizontal ledges arranged throughout the habitat, especially near the basking spot. A variety of climbing materials is necessary.
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Water Feature (Mandatory): A permanent, clean body of water large enough for the dragon to fully submerge and swim is essential. This can be a large plastic tub or a custom-built basin, and it must be easily removable or drainable for cleaning.
3. Substrate (Moisture Retention)
The substrate must be moisture-retaining and safe for accidental ingestion.
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Recommended Substrate: A mixture of Coconut Fiber (Coco Coir), Cypress Mulch, or organic topsoil. This should be kept consistently damp to aid humidity.
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Avoid: Small particle substrates like sand or walnut shells, which can lead to impaction.
4. Heating & Temperature
CWDs require high temperatures and a vertical thermal gradient.
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Primary Heat Source: An overhead basking lamp (halogen or incandescent) connected to a dimming thermostat.
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Basking Surface Temp (Crucial): 30°C – 35°C (85°F – 95°F). This should be measured directly on the highest basking branch.
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Cool Ambient Area (Bottom): 24°C – 27°C (75°F – 80°F).
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Water Temperature: Should be kept slightly warmer than room temperature, around 21°C – 24°C (70°F – 75°F), using a submerged water heater if necessary.
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Night Time Temperatures: Should not drop below 20°C (68°F).
5. Lighting & UV
As a diurnal, sun-basking lizard, strong UV light is essential.
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UVB Light: A high-output 10% or 12% T5 linear fluorescent tube is mandatory and must span at least two-thirds of the enclosure length, located near the basking area.
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Ambient Light: Full-spectrum LED lighting helps illuminate the large, tall enclosure.
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Photoperiod: Maintain a consistent 12-14 hour day/night cycle.
6. Humidity & Hydration
High, consistent humidity is mandatory for skin health and shedding.
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Ambient Humidity: Must be maintained between 60% and 80%. A digital hygrometer should be used for monitoring.
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Misting: Automated foggers or misters are highly recommended to provide high humidity spikes, especially in the morning.
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Water Quality: The water area must be kept impeccably clean, as they frequently defecate in it. Daily cleaning is often necessary.
7. Diet & Feeding
Water Dragons are omnivores but primarily consume insects in captivity.
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Staple Diet: Appropriately sized Crickets, Dubia Roaches, Locusts, and Earthworms.
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Vegetable/Fruit Supplement (10-20%): Offer small amounts of dark, leafy greens (collards, mustard greens) and non-citrus fruits sparingly.
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Feeding Frequency:
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Juveniles: Feed small insects daily.
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Adults: Feed a larger volume of insects every 2-3 days.
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Supplementation:
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Calcium Powder (Pure): Dust staple insects every other feeding (3-4 times per week).
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Calcium with D3 and Multivitamin: Dust insects once per week on a rotating schedule.
8. Handling & Maintenance
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Handling: They can be tamed and tolerate handling well, but handling should be limited to short periods. Never pull on the tail, as they can autotomize (drop) it.
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Caution: Males can become territorial and aggressive during breeding season. They are very fast and can jump or scratch when stressed.
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Maintenance: The most time-consuming task is cleaning the large water feature daily to prevent bacterial growth.