Mata mata turtle — Care Sheet & Morphs

Q: How big does an adult Mata mata turtle get?

An adult Mata mata turtle typically measures 40–50 cm.

Husbandry requirements

Mata mata turtle — origin: The Amazon basin (Brazil, Peru, Ecuador, Colombia, Venezuela, the Guianas, Bolivia). Since 2020, the Orinoco basin population has been described as a distinct species (Chelus orinocensis); C. fimbriata corresponds to the Amazon basin..

Terrarium temperature gradient

Night min24 °C

Cool side26–28 °C

Warm side28–30 °C

These are WATER temperatures. Maintain stable tropical water at 26-30 °C with a protected heater. No marked gradient or aerial hot spot needed: the species almost never basks. Avoid any prolonged cooling below ~24 °C (respiratory risk).

Enclosure (adult)

200 × 90 × 60 cm

Aquarium or heated, shallow tropical freshwater pool (a benthic aquatic species)

Indicative minimum for ONE adult; larger is always better. Favour shallow water allowing it to reach the surface without swimming, with a vast floor area. Décor of dead leaves, driftwood and branches; weak current. Provide a protected water heater and powerful but gentle filtration.

Humidity

80–100 %

A parameter of little relevance: a fully aquatic species. The ambient humidity remains high above the water.

Substrate

Fine sandLeaf litter (oak, catappa) for tannins and camouflageDriftwood and submerged branches

Avoid sharp gravel and small, ingestible pebbles. Dead leaves (oak, catappa/Indian almond) acidify and colour the water (blackwater), provide camouflage and security. A loose sand bottom allows the animal to partially bury itself.

UVB

Optional

Low priority: an aquatic species that practically never basks. Weak UVB (2-5%) is beneficial but not essential if the diet (whole fish, with bones and viscera) meets the calcium and vitamin D3 requirements.

Water source

Always available

The heart of husbandry. Tropical freshwater, SOFT and ACIDIC, of the Amazonian blackwater type: pH ~5.0-6.5, low hardness (low GH/KH), tinted with tannins (peat, oak/catappa leaves, wood). Temperature 26-30 °C. Effective filtration but WEAK current (a sedentary species, a poor swimmer). Limited depth allowing it to reach the surface without swimming, to be increased gradually with the size of the animal. Regular water changes. Hard, alkaline or dirty water leads to stress, food refusal and skin infections.

Origin

Chelidae

The Amazon basin (Brazil, Peru, Ecuador, Colombia, Venezuela, the Guianas, Bolivia). Since 2020, the Orinoco basin population has been described as a distinct species (Chelus orinocensis); C. fimbriata corresponds to the Amazon basin.

Feeding & health

Diet

Carnivore / piscivore — Varied live fish (guppies, mollies, tilapia, catfish, minnows...), occasionally earthworms and shrimp.

It feeds by a lightning-fast gape-and-suck action and reacts only to live prey IN MOTION. It rarely accepts pellets or dead fish. Avoid goldfish/roach as a staple (thiaminase + excess fat → vitamin B1 deficiency): vary the prey. Indicative frequency: juveniles several times a week, adults 1 to 2 times a week.

Breeding

Oviparous

Clutch 8–30 eggs/young. Terrestrial egg-laying near the water. Long and variable incubation (often ~200 days, sometimes more, at 27-29 °C). Reproduction rare and poorly documented in captivity; sex determination probably genetic (no clearly established TSD).

Health watch points

Skin and shell infections (dermatitis, scute rot) linked to water that is too hard/alkaline or of poor quality
Thiamine (vitamin B1) deficiency due to a diet of fish rich in thiaminase (goldfish) → neurological disorders
Respiratory infections / pneumonia when the water is too cold or unstable
Eye infections and irritations linked to unsuitable water
Chronic stress and food refusal (non-acidified water, handling, a poorly acclimatised and parasitised wild specimen)

Morphs & genetics

Registry of 3 documented genes for Mata mata turtle.

Albino (T-) amelanisticRec
LeucisticRec
Hypomelanistic light phaseDom

Pairing calculator

Pick each parent's genotype — clutch probabilities update live. Free, no sign-up.

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Mata mata turtle × Mata mata turtle

Probabilities per gene (independent loci).

Expected clutchSelect at least one gene on a parent.

Frequently asked questions

Answers to the most common questions about keeping the mata mata turtle.

How big does an adult Mata mata turtle get?▾

An adult Mata mata turtle typically measures 40–50 cm (length of the carapace (shell); record >55 cm. adult weight often 10-15 kg. the large floor footprint and the volume of water required are the real limiting factor, more than the size itself.).

What temperature and humidity does a Mata mata turtle need?▾

A gradient of roughly 26–28 °C on the cool side to 28–30 °C on the warm side. Humidity 80–100 %.

What does a Mata mata turtle eat?▾

Carnivore / piscivore: Varied live fish (guppies, mollies, tilapia, catfish, minnows...), occasionally earthworms and shrimp..

Is the Mata mata turtle a good reptile for beginners?▾

Advanced level. Sedentary and cryptic. It mimics a pile of dead leaves and submerged wood. It moves very rarely, except to surface to breathe or to snap up prey. Handling is stressful and can injure the soft edges of the carapace and plastron; keep it to the strict minimum. Plan ahead: a lifespan of 40–75 yrs.

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