Reeves’s Turtle (Mauremys reevesii) Care Sheet
Reeves’s Turtle is a small to medium-sized freshwater turtle native to East Asia. It is also known as the Chinese Pond Turtle or Chinese Three-Keeled Pond Turtle, referring to the three distinctive longitudinal keels that are particularly noticeable on the shell of younger animals.
Reeves’s Turtles can make fascinating captive animals for appropriately prepared keepers. However, they are long-lived reptiles requiring considerably more space and specialist equipment than their small juvenile size may initially suggest.
Good husbandry depends upon spacious aquatic accommodation, excellent water quality, a completely dry basking area, appropriate heating and UVB exposure, a balanced diet and a long-term commitment to the animal.
Quick Facts
Scientific name: Mauremys reevesii
Common names: Reeves’s Turtle, Chinese Pond Turtle, Chinese Three-Keeled Pond Turtle
Family: Geoemydidae
Origin: East Asia
Adult size: Commonly approximately 12–20 cm shell length, with females generally larger than males
Lifespan: Commonly 20–30+ years and potentially considerably longer
Diet: Omnivorous
Activity: Primarily diurnal
Lifestyle: Semi-aquatic/freshwater
Experience level: Beginner to intermediate with appropriate research
Temperament: Generally alert and relatively calm, although individuals vary
Natural Habitat
Reeves’s Turtles naturally inhabit relatively calm freshwater environments.
Habitats can include:
- Ponds
- Marshes
- Swamps
- Slow-moving streams
- Canals
- Rice paddies
- Shallow lakes
- Wetland areas
They generally favour water with abundant vegetation and easily accessible terrestrial or emergent basking sites.
Appearance
Reeves’s Turtles possess a relatively rectangular or oval shell.
One of their most characteristic features is the presence of three longitudinal keels running along the carapace.
These keels are usually particularly noticeable in younger animals and may become less pronounced with age.
Colouration can include:
- Brown
- Olive
- Dark brown
- Grey
- Nearly black in some mature individuals
The head and neck may display lighter yellowish or cream markings.
Adult Size
Adult size varies according to sex, genetics and population.
Many adults reach approximately:
12–20 cm (5–8 in) shell length
Females generally become larger and heavier-bodied than males.
Juveniles may be sold at only a few centimetres long, but accommodation should always be planned around adult dimensions.
Lifespan
Reeves’s Turtles are long-lived animals.
With appropriate husbandry they may live:
20–30+ years
and potentially considerably longer.
Obtaining one should therefore be regarded as a long-term commitment rather than a short-term pet purchase.
Housing
Reeves’s Turtles require a spacious aquatic enclosure with a completely dry basking area.
The enclosure should provide:
- Substantial swimming space
- Different water depths
- Easy access to the surface
- Powerful filtration
- Dry basking area
- Heat
- UVB
- Hides
- Environmental enrichment
Small plastic turtle bowls and similar containers are completely unsuitable for permanent housing.
Enclosure Size
Larger accommodation should always be preferred.
For a single adult, an enclosure around 120 cm in length provides a useful general starting point, particularly for larger females.
More space is beneficial.
Usable floor area and water volume are both important.
The turtle should be able to:
- Swim freely
- Turn easily
- Dive
- Surface
- Explore
- Rest underwater
- Leave the water completely
Enclosure dimensions should always be adjusted according to the individual animal.
Water Depth
Reeves’s Turtles are capable swimmers, although they are not as strongly adapted to deep open water as some highly aquatic turtle species.
Provide sufficient depth for normal swimming while incorporating:
- Shallow areas
- Submerged resting points
- Branches
- Rocks
- Platforms
- Vegetation
The turtle should be able to reach the surface easily.
Young juveniles should initially be provided with shallower water and numerous resting points.
Water Temperature
For healthy adults, a useful general water temperature range is approximately:
22–25°C
Juveniles may benefit from slightly warmer conditions.
Temperature requirements should be adjusted according to:
- Age
- Health
- Season
- Room temperature
- Behaviour
Always monitor water temperature using a reliable thermometer.
Water Heating
An aquarium heater may be required where ambient room temperatures are insufficient.
Any heater accessible to the turtle should be:
- Securely mounted
- Appropriately sized
- Thermostatically controlled
- Protected by a heater guard
Turtles can damage exposed aquarium equipment.
Basking Area
A completely dry basking area is essential.
The turtle must be able to leave the water and dry its entire:
- Carapace
- Plastron
- Limbs
The platform should be:
- Stable
- Easy to access
- Non-slip
- Large enough for the entire turtle
- Positioned beneath heat and UVB lighting
Basking Temperature
A useful basking surface temperature is approximately:
30–33°C
Measure the actual basking surface rather than relying solely on air temperature.
The turtle must always be able to move away from the heat.
UVB Lighting
Appropriate UVB exposure is essential for healthy captive management.
UVB assists with:
- Vitamin D3 production
- Calcium metabolism
- Bone development
- Shell health
Use a reputable reptile UVB lamp positioned appropriately above the basking area.
UVB should not pass through glass or plastic before reaching the turtle.
Where possible, UV intensity should be checked with an appropriate UV meter.
Lighting
Provide a consistent day/night cycle.
Approximately:
10–12 hours of light per day
provides a useful general starting point.
All visible enclosure lighting should normally be switched off overnight.
A timer can help maintain a consistent photoperiod.
Filtration
Reeves’s Turtles produce considerably more waste than similarly sized aquarium fish.
Powerful filtration is therefore essential.
External canister filters are commonly suitable because they can provide:
- Mechanical filtration
- Biological filtration
- High filter-media capacity
- Strong circulation
A filter rated substantially above the actual aquarium water volume is often useful for turtle accommodation.
Water Quality
Good water quality is fundamental to long-term health.
Poor water conditions can contribute to:
- Skin irritation
- Eye problems
- Shell infections
- Increased bacterial growth
- Unpleasant odours
Regular partial water changes remain necessary even when powerful filtration is installed.
Uneaten food and obvious waste should be removed promptly.
Water Testing
Keepers should understand basic aquarium water chemistry.
Useful parameters include:
- Ammonia
- Nitrite
- Nitrate
- pH
A mature biological filter should prevent dangerous accumulation of ammonia and nitrite.
Substrate
Suitable options include:
- Bare-bottom accommodation
- Fine sand
- Large smooth stones too large to swallow
Avoid small gravel that could potentially be ingested.
Fine sand can encourage natural digging and foraging behaviour when maintained correctly.
Furnishings
A well-structured enclosure can encourage natural behaviour.
Suitable furnishings include:
- Driftwood
- Secure rocks
- Aquatic plants
- Artificial plants
- Submerged platforms
- Hides
- Branches
All furnishings must be stable.
Underwater structures should never create narrow spaces where the turtle could become trapped.
Plants
Live aquatic plants can provide:
- Cover
- Visual barriers
- Enrichment
- Foraging opportunities
However, Reeves’s Turtles may damage or eat plants.
Only turtle-safe species should be used.
Artificial plants can also provide useful cover if they are robust and cannot be swallowed.
Diet
Reeves’s Turtles are omnivorous.
Their natural diet can include:
- Aquatic invertebrates
- Worms
- Insects
- Molluscs
- Small aquatic animals
- Carrion
- Aquatic vegetation
- Other plant material
Captive diets should provide appropriate variety.
Commercial Turtle Food
A high-quality complete aquatic-turtle pellet can form an important foundation of the diet.
Choose a reputable product specifically formulated for aquatic or semi-aquatic turtles.
Commercial pellets should be supplemented with appropriate fresh foods rather than becoming the only dietary item.
Animal-Based Foods
Suitable foods can include appropriately sized:
- Earthworms
- Snails
- Crickets
- Locusts
- Aquatic invertebrates
- Appropriate whole freshwater fish
Food should come from safe sources free from pesticides and environmental contaminants.
Plant Foods
Plant material should form part of the diet, particularly as animals mature.
Suitable options can include:
- Dandelion greens
- Endive
- Escarole
- Mustard greens
- Collard greens
- Appropriate aquatic plants
Offer variety rather than relying upon one plant food.
Calcium
Adequate calcium is essential for normal skeletal and shell health.
Calcium can be supplied through:
- Balanced commercial turtle foods
- Appropriate whole prey
- Calcium-rich plant foods
- Cuttlebone where suitable
- Supplementation where required
Correct UVB exposure is also important for calcium metabolism.
Foods to Avoid
Avoid routinely feeding:
- Bread
- Dairy products
- Processed human foods
- Dog food
- Cat food
- Seasoned cooked meat
- Large quantities of fatty meat
- Dried shrimp as the main diet
Dried shrimp may be used occasionally but are not nutritionally complete.
Feeding Frequency
Juveniles generally require smaller meals more frequently than adults.
Healthy adults can usually be offered appropriately sized meals several times per week, with suitable plant material available regularly.
Feeding should be adjusted according to:
- Age
- Size
- Activity
- Body condition
- Health
- Water temperature
Overfeeding should be avoided.
Behaviour
Reeves’s Turtles are generally active and inquisitive.
Common behaviours include:
- Swimming
- Walking along the bottom
- Foraging
- Basking
- Exploring
- Resting beneath cover
Individuals often learn to associate their keeper with feeding.
This should not be confused with a need for physical handling.
Temperament
Many Reeves’s Turtles become relatively accustomed to normal activity around their enclosure.
However, individuals vary.
A frightened turtle may:
- Withdraw
- Struggle
- Scratch
- Bite
Providing hiding places and avoiding unnecessary disturbance helps reduce stress.
Handling
Routine recreational handling should be minimised.
Handling is most appropriate for:
- Health checks
- Veterinary care
- Transportation
- Necessary enclosure maintenance
Support the turtle securely with both hands.
Never lift a turtle by its tail.
Hygiene
Aquatic turtles can carry Salmonella and other microorganisms without showing signs of illness.
Wash hands thoroughly after:
- Handling the turtle
- Touching enclosure water
- Cleaning the filter
- Handling substrate
- Preparing food
Avoid cleaning turtle equipment in areas used for preparing human food.
Children should be appropriately supervised.
Sexing
Adult males and females can usually be distinguished.
Males generally have:
- Longer tails
- Thicker tail bases
- Cloacal openings positioned farther along the tail
Females generally:
- Grow larger
- Have shorter tails
- Possess more compact tail bases
Sexing young juveniles may be unreliable.
Social Housing
Reeves’s Turtles do not require companionship.
Housing multiple individuals together can lead to:
- Aggression
- Biting
- Food competition
- Basking competition
- Chronic stress
- Mating harassment
Males may be particularly territorial.
Separate housing is often the safest option.
If turtles are kept together, keepers must be prepared to separate them permanently at the first sign of persistent conflict.
Breeding
Reeves’s Turtles are egg-laying reptiles.
Females require access to an appropriate nesting area when reproductively active.
A female can potentially produce eggs even when no male is present.
Nesting
Suitable nesting substrate should be:
- Diggable
- Deep enough for normal excavation
- Appropriately moist
- Secure
- Warm enough for normal nesting behaviour
Signs of an impending clutch may include:
- Restlessness
- Increased exploration
- Attempts to leave the enclosure
- Digging
- Changes in appetite
Persistent inability to lay eggs requires veterinary attention.
Egg Retention
Retained eggs can become a serious medical problem.
Potential signs include:
- Persistent restlessness
- Repeated digging without laying
- Reduced appetite
- Weakness
- Straining
- Unusual posture
Suspected egg retention requires assessment by a reptile-experienced veterinarian.
Health
Potential health concerns include:
- Respiratory infections
- Shell infections
- Metabolic bone disease
- Nutritional deficiencies
- Eye problems
- Parasites
- Obesity
- Trauma
- Egg retention
Regular observation helps detect problems early.
Warning Signs
Seek veterinary advice if the turtle develops:
- Persistent loss of appetite
- Unexplained weight loss
- Swollen or closed eyes
- Nasal discharge
- Open-mouth breathing
- Abnormal floating
- Difficulty diving
- Soft shell
- Shell lesions
- Foul odour
- Persistent lethargy
- Significant behavioural changes
A veterinarian experienced with reptiles should assess suspected illness.
Shell Health
A healthy shell should generally remain firm and free from:
- Deep pits
- Bleeding
- Ulcers
- Soft areas
- Foul odours
- Significant unexplained discolouration
Some normal changes occur as turtles grow.
Never forcibly peel or remove shell scutes.
Respiratory Disease
Possible signs of respiratory disease include:
- Nasal discharge
- Bubbles around the nose
- Wheezing
- Open-mouth breathing
- Reduced appetite
- Lethargy
- Uneven floating
Respiratory disease can become serious and requires veterinary assessment.
Outdoor Housing
Secure outdoor accommodation can be beneficial in suitable climates.
Outdoor enclosures must protect against:
- Escape
- Predators
- Excessive heat
- Excessive cold
- Flooding
- Contaminated water
- Unauthorised access
Both sunlight and shade must be available.
Brumation
Wild Reeves’s Turtles may experience seasonal periods of reduced activity in cooler conditions.
Deliberately brumating captive animals is not required for ordinary pet husbandry.
Brumation should never be attempted casually, particularly with animals that are:
- Underweight
- Ill
- Newly acquired
- Very young
- Poorly conditioned
Specialist advice should be obtained where controlled seasonal cooling is considered necessary.
Conservation
Wild Reeves’s Turtle populations have experienced substantial pressure from:
- Habitat destruction
- Wetland modification
- Collection
- Wildlife trade
- Food markets
- Traditional-use industries
Responsible captive keeping should favour animals with documented captive-bred origins.
Wild-caught animals should be avoided wherever possible.
Hybridisation
Species within the genus Mauremys and related Asian turtles can hybridise in captivity.
Animals intended for conservation breeding should therefore have reliable identification and provenance.
Unplanned hybridisation should be avoided.
Captive-Bred Animals
A healthy captive-bred animal from a responsible source should be preferred.
Before acquisition, establish:
- Species identification
- Captive-bred status
- Approximate age
- Feeding history
- Health history
- Sex where known
Avoid purchasing turtles with obvious:
- Swollen eyes
- Nasal discharge
- Soft shells
- Severe shell damage
- Abnormal swimming
- Extreme lethargy
Legal Considerations
Wildlife regulations differ between countries and regions.
Depending upon location, restrictions may apply to:
- Ownership
- Sale
- Breeding
- Import
- Export
- Transport
Keepers should check current local legislation before acquiring or transferring a Reeves’s Turtle.
Never release a captive turtle into the wild.
Responsible Ownership
Before acquiring a Reeves’s Turtle, consider:
- Adult enclosure size
- Filtration requirements
- Heating costs
- UVB replacement
- Water consumption
- Veterinary expenses
- Holiday care
- Potential lifespan
- Long-term housing
A small juvenile can become a decades-long commitment.
Summary
Reeves’s Turtle (Mauremys reevesii) is an attractive and active freshwater turtle recognised by the characteristic three keels running along its shell.
Successful captive husbandry depends upon spacious aquatic accommodation, excellent filtration and water quality, a completely dry heated basking area, appropriate UVB exposure, environmental enrichment and a varied omnivorous diet.
Although relatively manageable in size compared with many aquatic turtles, Reeves’s Turtles are long-lived animals requiring substantial equipment and a commitment potentially lasting several decades.
IMPORTANT INFORMATION
This care sheet provides general husbandry guidance and does not replace professional veterinary advice or current species-specific research.
Always research the individual requirements of your turtle and comply with applicable wildlife and animal-welfare legislation.
If you are concerned about your turtle’s health, consult a veterinarian experienced with reptiles.
Information correct at the date of publication.
reptilecommunity.com | Revised: August 2026