Reeves's Turtle

🔤 Taxonomy

Mauremys reevesii is the current name for Reeves’s turtle. Chinemys reevesii is a common older combination in books and trade lists.

English common names used in the hobby:

• Reeves’s turtle
• Chinese three-keeled pond turtle

German common names used in the hobby:

• Chinesische Dreikielschildkröte
• Reeves-Schildkröte

📌 Description

The reeves’s turtle (Mauremys reevesii) is a hardy but messy semi-aquatic turtle that needs clean water and a secure basking site. Adults reach about 15-23 cm and may live 20-30 years or more with good long-term care.

This is not a short-term aquarium pet. Even small aquatic turtles produce heavy waste, need strong filtration, and require both deep usable water and a completely dry basking area.

Three raised keels are especially obvious in young animals and usually become less pronounced with age. Adult females commonly grow larger and broader than males, so an enclosure bought around a juvenile’s shell length can become inadequate. The species often uses quiet, plant-rich shallows rather than living continuously in exposed deep water; security and easy resting access matter as much as total litres.

🌍 Distribution

Mauremys reevesii is native to eastern Asia, including China, Korea, Taiwan, and Japan. It uses ponds, rice fields, canals, marshes, slow streams, and vegetated shallow water.

In care, those habitat needs become clean water, secure exits, usable swimming space, dry basking access, visual cover, and stable seasonal or tropical temperatures as appropriate.

🌡 Climate across the native range

Monthly climate normals from reviewed GBIF occurrence locations:

Weather data by WorldClim v2.1 · Monthly normals queried by Herpeton Academy from raster values; relative humidity is derived from vapor pressure and mean temperature.

Location references use GBIF.org occurrence data where available; original occurrence records retain their source dataset licenses.

⚖️ Legal status

Mauremys reevesii is listed in CITES Appendix III at the request of China and is treated in EU Annex C. Keep proof of legal origin and check national rules before buying, selling, importing, or breeding.

The Bern Convention is not usually relevant unless a species is native to Europe or covered by local conservation rules; check current national guidance for the country where the animal is kept.

🤌 Husbandry

One adult needs at least 100-120 cm of tank length, with females needing more space. Larger is always better, especially for females and strong swimmers. A bare small tank is not acceptable long term.

Plan from the adult sex and size: a small male may use a 120 × 60 cm footprint well, while a large female benefits from 150 cm length or a pond-style enclosure. Healthy adults can swim in deep water, but add broad submerged shelves, cork, and planted margins so they can rest and breathe without crossing open water. Hatchlings, weak animals, and new arrivals should begin shallower and gain depth only as coordination is confirmed.

The setup must include:

• deep enough water for normal swimming and turning
• an easy route to the surface
• a dry basking platform that supports the full body
• secure lids or high walls to prevent escape
• visual cover and resting points

Cohabitation is risky. Males may harass females, and turtles that appear peaceful can still bite, compete, or stress each other.

Reeves’s turtles in trade may be captive-bred, farmed, or imported. Quarantine a new arrival in a simple separate system with dedicated tools, record weight and feces, and seek reptile-veterinary testing when origin is uncertain. Shell pitting, swollen eyes, nasal bubbles, asymmetric swimming, or failure to bask are reasons for examination, not reasons to add another animal for company.

🧪 Filtration and water

Aquatic turtles foul water quickly. Use oversized external filtration, regular partial water changes, and mechanical cleaning of trapped waste. Filter ratings for fish aquariums are usually too optimistic for turtles.

Ammonia and nitrite should remain at zero in an established system. Cloudy water, smell, skin irritation, and repeated eye problems often point to poor water quality rather than a need for medication.

Use a fully cycled biological filter and test ammonia, nitrite, nitrate, and source-water chemistry. Keep the outflow gentle enough that quiet resting zones remain available. A guarded heater prevents shell impact and burns, while a pre-filter keeps toes and small turtles away from strong intakes. Partial water changes should match dechlorinated replacement water closely in temperature.

💡 Lighting

A dry basking area needs bright light and UVB. A quality T5 HO UVB tube or suitable mercury vapor system should cover the basking zone at the correct distance. Replace UVB lamps according to manufacturer output guidance.

Window glass blocks useful UVB, so sunlight through glass is not a substitute. Night lighting is unnecessary.

For UV planning, treat this species as Ferguson Zone 2. Aim for about UVI 1-2 at the animal’s back or shell height in the basking zone, with a gradient down to shaded areas near zero UVI. This usually points to a moderate 5-7% T5/Forest-style UVB tube at a measured safe distance; measure with a Solarmeter 6.5 when possible, because reflector, mesh, distance, and lamp age change the real exposure.

🌡 Heating and temperature

Typical targets are:

• water: 22-26°C
• basking surface: 31-34°C
• cooler night/room air: about 20-22°C

Use thermostats and thermometers rather than guessing. The basking area should warm the turtle locally without overheating the entire aquarium.

💧 Humidity and water

Humidity is usually managed by the water itself. The important point is to keep the basking platform genuinely dry and warm so the shell and skin can dry completely.

Clean drinking and swimming water are the same system for most aquatic turtles, so water quality is a husbandry requirement, not decoration.

🌿 Enclosure and decoration

Use smooth rocks, driftwood, cork, sturdy aquatic plants, and resting ledges. Avoid sharp stones, unstable piles, tiny gravel that can be swallowed, and decorations that trap the turtle underwater.

Substrate can be bare-bottom, large river stones, or sand depending on the species and filtration plan. Every decoration must be easy to clean and impossible to collapse.

🪱 Feeding

Feed a varied diet based on quality turtle pellets, aquatic invertebrates, earthworms, fish items, leafy aquatic plants, and increasing plant matter with age. Juveniles usually need smaller, more frequent meals; adults should be fed more moderately to prevent obesity and water pollution.

Young turtles generally accept more invertebrate prey, whereas adults should be trained onto a genuinely mixed ration with a larger plant component. Use a complete pellet as the measured foundation, then rotate earthworms, snails, insect larvae, and safe greens or aquatic plants. Dried shrimp, fish fillet, and meat are not complete staples. Remove food scraps promptly, and judge meal size by body condition and growth rather than by persistent begging.

Calcium should be available through whole prey, cuttlebone, or appropriate supplementation. Do not use mammal meat, dog food, cat food, bread, dairy, or fatty processed foods.

🧭 Routine, behavior, and handling

Most captive problems are prevented by routine rather than by occasional major cleaning. Check water clarity, temperature, basking access, appetite, and shell condition every week. Remove uneaten food quickly and do not let waste collect under hides, rocks, or filter intakes.

Handling should be minimal. Aquatic turtles are better observation animals than hand pets; repeated handling causes stress and increases the risk of bites, falls, and shell injuries. When handling is necessary, support the whole body securely and keep the turtle low over a safe surface.

A simple maintenance rhythm works well:

• test or monitor water quality regularly
• rinse mechanical filter media before flow drops
• replace part of the water before it smells or clouds
• inspect the basking platform for damp spots
• weigh juveniles or recovering animals when growth or health is uncertain

Never release unwanted turtles outdoors. Rehoming through responsible keepers or rescue networks is the only acceptable option.

🩺 Common problems

Common problems include shell rot from a wet basking area, eye and skin irritation from dirty water, obesity from overfeeding, soft shell or poor growth from inadequate UVB/calcium, burns from unsafe heat lamps, and injuries from cohabitation.

Seasonal slowing is possible, but controlled brumation is an advanced procedure for healthy, well-established adults only. Do not cool a juvenile, underweight, sick, parasitized, or newly acquired turtle. A first planned cooling should follow veterinary review and a measured preparation protocol; simply switching off an indoor heater can leave the animal digesting poorly in unstable temperatures. Adult females also require a private box of deep, slightly moist soil-sand substrate for nesting even if housed without a male, because unfertilized eggs can still be produced.

Persistent swelling, floating problems, refusal to eat, wheezing, open-mouth breathing, bleeding, or shell lesions require an experienced reptile veterinarian.

📌 Conclusion

Reeves’s Turtle can be a rewarding display turtle, but only when kept as a long-term aquatic reptile with space, filtration, UVB, heat, and clean water. Plan the adult setup before buying a juvenile.

📚 Sources and further reading

• ReptiFiles aquatic-turtle care library (comparative enclosure, filtration, basking, and lighting review)
• Baines et al. 2016, UVB provision for captive reptiles
• Turtles of the World checklist and GBIF species data for taxonomy and distribution context
• CITES Appendices and EU wildlife-trade guidance, checked 2026-05-04