Spiny Softshell Turtle — Care Sheet & Morphs

Husbandry requirements

Spiny Softshell Turtle — origin: North America (central and eastern United States, southern Canada, north-eastern Mexico) — rivers, lakes and watercourses with sandy or muddy bottoms..

Terrarium temperature gradient

Night min20 °C

Cool side22–24 °C

Warm side24–26 °C

Basking spot30–35 °C

WATER temperature for adults (slightly warmer for juveniles), with a gentle gradient. In addition, provide a heated dry basking platform under a lamp. Do not let the water drop too low at night. A slight winter cooling should only be considered by experienced keepers.

Enclosure (adult)

300 × 120 × 60 cm

A spacious aquarium/aquatic pool with a fine-sand bottom and an accessible dry basking area.

Minimum dimensions for a large adult: a giant female needs, in practice, an indoor pool rather than a simple aquarium (tank length equal to several times the carapace length). Provide shallow zones: a buried animal reaches its neck up to the surface to breathe. REGULATORY STATUS: non-venomous and not CITES-listed; to date not on the EU list of invasive alien species of Union concern (EU Invasive Alien Species Regulation), but this list is being updated and several North American turtles appear on it — check the legislation in force before acquisition. Wild Canadian populations are protected (species at risk): any capture in the wild is prohibited there. Favour a captive-bred animal.

Humidity

80–100 %

Aquatic species: air humidity is not a relevant parameter (a submerged animal). Nevertheless, provide a dry area for basking.

Substrate

Fine sand (silica)Fine washed river sand

Fine sand is MANDATORY, several centimetres deep, to allow burrowing (essential for well-being and stress reduction). Ban gravel, coarse sand and abrasive décor, which injure the soft carapace and plastron and open the door to infections.

UVB

Recommended

Yes — UVB is essential above the dry basking area (a suitable high-output UVB tube depending on the distance) for vitamin D synthesis and for bone and shell health.

Water source

Always available

Impeccable water and powerful filtration: softshell turtles are extremely sensitive to water quality — poor water causes fungal infections and shell rot. Regular water changes, undetectable ammonia and nitrites, gentle circulation. Provide deep zones for swimming and shallows for breathing at the surface effortlessly.

Origin

Trionychidae

North America (central and eastern United States, southern Canada, north-eastern Mexico) — rivers, lakes and watercourses with sandy or muddy bottoms.

Feeding & health

Diet

Carnivore — Crayfish and crustaceans, whole fish, molluscs, earthworms, insects and larvae.

An active hunter that snatches its prey from the sand thanks to its long neck. A varied meat-based diet; juveniles are more insectivorous. Avoid an excess of fatty fish, supplement with calcium, and feed in the water.

Breeding

Oviparous

Clutch 9–38 eggs/young. Summer egg-laying in loose, sandy soil near the water; spherical eggs with a fragile, brittle shell. Incubation at moderate warmth. Breeding reserved for experienced keepers.

Health watch points

Shell rot / ulceration (SCUD) of bacterial or fungal origin, promoted by poor water quality
Fungal infections of the skin and the soft shell
Abrasions and lesions from an unsuitable substrate (gravel), entry points for infection
Respiratory infections (water too cold, draughts)
Metabolic bone disease / vitamin D deficiency in the absence of sufficient UVB and calcium

Morphs & genetics

Registry of 4 documented genes and 1 named combos for Spiny Softshell Turtle.

Albino (T-) amelanisticRec
AxanthicRec
LeucisticRec
Hypomelanistic / Pastel light phaseDom

Named combos — 1 documented combined morphs

Snow

Pairing calculator

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Spiny Softshell Turtle × Spiny Softshell 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 spiny softshell turtle.

Is the spiny softshell turtle suitable for a beginner?▾

No, its care level is rated advanced. Nervous, skittish and quick to flee, it can bite hard thanks to its long, highly mobile neck and sharp jaws; its bite is not venomous but is still painful. Its slippery skin and temperament make it difficult to handle, reserving it for experienced keepers.

Why is a fine sand substrate mandatory?▾

A layer of fine sand several centimetres deep is essential, since this turtle buries itself to feel safe, which greatly reduces its stress. Gravel, coarse sand and abrasive décor must be avoided, as they injure its soft carapace and plastron and open the door to infections.

How large can this turtle grow?▾

Sexual dimorphism is extreme: males stay small, with a carapace of 12 to 24 cm, while females become giant, at 25 to 50 cm, with a record exceeding 54 cm. The setup therefore needs to be sized according to the animal's sex.

How much water volume is needed for an adult?▾

A 40 to 50 cm female needs, in practice, a real indoor pool, not a simple aquarium, with a tank length of at least 5 to 6 times the carapace length (minimum dimensions of around 300 x 120 x 60 cm). Both deep zones for swimming and shallows are needed, where the buried animal stretches its neck to the surface to breathe.

What temperature should the water and basking spot be kept at?▾

The water is kept between 24 and 26 °C for adults (rather 25-27 °C for juveniles), with a slight gradient, and should not drop below around 20 °C at night. A dry basking platform heated to 30-35 °C under a lamp, accessible out of the water, is also needed.

Why are filtration and water quality so crucial?▾

Softshell turtles are extremely sensitive to water quality: poor water quickly causes fungal infections and shell rot. Powerful filtration, regular water changes, zero ammonia and nitrites, and gentle circulation are needed.

Is UVB lighting necessary?▾

Yes, UVB is essential above the dry basking area, with a 5.0 to 10.0% tube (T5 HO type depending on distance). It enables vitamin D3 synthesis, essential for bone and shell health.

What does the spiny softshell turtle eat?▾

It is a carnivore and an active hunter that snatches its prey from the sand thanks to its long neck: crayfish and crustaceans, whole fish, molluscs, earthworms, insects and larvae. Juveniles are more insectivorous; the diet should be varied, excess fatty fish avoided, calcium supplemented, and feeding always done in the water.

How long does this species live?▾

It commonly lives 25 to 50 years in captivity, and potentially beyond 50 years. It is a commitment spanning several decades that must be anticipated before any acquisition.

Is keeping it regulated?▾

The species is not venomous and is not CITES-listed; to date it is also not listed among the invasive alien species of concern for the EU, but this list evolves and several North American turtles appear on it, hence the importance of checking the legislation in force. Since wild Canadian populations are protected (a species at risk), a captive-bred animal should be preferred.

How does it reproduce?▾

It is oviparous and lays 9 to 38 spherical eggs with a fragile, brittle shell, generally in summer in loose, sandy soil near the water. Incubation takes place at around 26 to 30 °C. Breeding is reserved for experienced breeders.

What are the main health problems?▾

The most common are shell rot and ulceration (SCUD) of bacterial or fungal origin, promoted by poor water quality, skin fungal infections, abrasions caused by an unsuitable substrate such as gravel, respiratory infections from water that is too cold or draughts, and metabolic bone disorders in the absence of sufficient UVB and calcium.

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