Banded water snake — Care Sheet & Morphs

Husbandry requirements

Banded water snake — origin: Southeastern United States (from the Carolinas to Florida, as far as Texas), along watercourses, marshes, ponds and coastal wetlands..

Terrarium temperature gradient

Night min20 °C

Cool side22–24 °C

Warm side28–30 °C

Basking spot30–32 °C

NON-VENOMOUS but strongly resembles the venomous cottonmouth (Agkistrodon piscivorus): it has a round pupil and no loreal pit. Its slightly anticoagulant saliva makes bites bleed but without toxic danger. Not listed on CITES; wild collection is strongly discouraged (stress, parasites, protected status in some US states) — favour a captive-bred animal. Establish a clear thermal gradient: hot spot/basking 30-32 °C above the dry platform, cool side 22-24 °C, a nighttime drop tolerated down to ~20 °C; heat the land area rather than the water.

Enclosure (adult)

120 × 60 × 60 cm

Semi-aquatic terrarium / paludarium: large permanent water area + dry land area with a resting spot and hides on both sides.

Minimum dimensions for an adult (120x60x60 cm). Provide sufficient height and a well-secured lid, as the species is agile and can escape. A large water surface (allowing full immersion) combined with a dry platform for basking is essential.

Humidity

50–70 %

Moderate to high humidity, naturally maintained by the large water surface. Ensure good ventilation to avoid stagnant air and skin problems.

Substrate

Absorbent paper / paper towel (simple, very hygienic setup)Cypress mulchCoconut fibre

For the land part, an easy-to-clean substrate is recommended as the species soils its environment a great deal. Avoid aspen, which moulds on contact with moisture. A simple setup (paper + large water container) makes maintenance and health monitoring easier.

UVB

Optional

Not strictly essential for this colubrid, but a low UVB (UV index 1-2, T5 5% tube) is beneficial for this diurnal semi-aquatic species that basks in the sun; combine with a regular day/night cycle.

Water source

Always available

A large, clean, permanent water area allowing complete immersion. The animal often defecates and feeds in the water: effective filtration and/or frequent water changes are essential to prevent skin infections. Clean and disinfect regularly.

Origin

Colubridae

Southeastern United States (from the Carolinas to Florida, as far as Texas), along watercourses, marshes, ponds and coastal wetlands.

Feeding & health

Diet

Piscivore / amphibian-eater — Fish and amphibians (frogs); can be accustomed to fish-scented rodents.

Absolutely avoid fish rich in thiaminase (goldfish, smelt), which cause a thiamine (vitamin B1) deficiency: favour trout, tilapia, capelin, silverside. Vary the diet and supplement with vitamin B1 if the diet relies heavily on fish. Feeding outside the main tank reduces the risk of accidental bites and water contamination.

Breeding

Viviparous

A very prolific species. Breeding is generally triggered by a winter brumation period (cooling to 12-16 °C for several weeks) followed by spring warming. Birth in late summer; the newborns are independent and quickly feed on small fish.

Health watch points

Skin infections / scale rot (scale rot, blister disease) linked to dirty water or an environment that is too humid and poorly ventilated
Significant internal parasitism, especially in wild-caught individuals (trematodes, nematodes transmitted by fish and amphibians)
Thiamine (vitamin B1) deficiency due to a diet of fish rich in thiaminase
Respiratory infections (temperatures too low or stagnant humidity)
Stomatitis (mouth rot) and regurgitation / food refusal linked to stress

Morphs & genetics

Registry of 3 documented genes for Banded water snake.

Albino (T-) amelanisticRec
Hypomelanistic hypoRec
Anerythristic (Hypothetical) axanthicRec

Pairing calculator

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Banded water snake × Banded water snake

Probabilities per gene (independent loci).

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Frequently asked questions

Answers to the most common questions about keeping the banded water snake.

Is the banded water snake dangerous, and why is it confused with the cottonmouth?▾

No, it's not venomous, but its slightly anticoagulant saliva makes defensive bites bleed fairly heavily without any toxic danger. It's often mistaken for the venomous cottonmouth (Agkistrodon piscivorus): it can be told apart by its round pupil and the absence of a loreal pit. Wild-caught specimens remain notoriously defensive (biting and releasing a foul-smelling musk), while captive-bred individuals can become more docile without ever losing their food-driven voracity.

How big does this water snake get as an adult?▾

It typically measures 60 to 110 cm, with females being stouter and occupying the upper end of that range, exceptionally approaching 130-150 cm. Its stocky body is covered in keeled scales, giving it a rough texture to the touch.

What kind of setup does it need, between water and land?▾

A semi-aquatic terrarium or paludarium of at least 120 x 60 x 60 cm, combining a large permanent water area allowing full immersion with a dry land platform for resting and basking, with hides on both sides. The lid must be securely fastened, as this is an agile species capable of escaping.

How should heating be arranged between the water zone and the land zone?▾

Heat the land zone rather than the water: a basking spot of 30-32 °C above the dry platform, a cool side at 22-24 °C, and a nighttime drop tolerated down to around 20 °C. This clear gradient lets it thermoregulate by alternating between swimming and basking.

What humidity level should be targeted?▾

Moderate to high humidity of 50 to 70%, naturally maintained by the tank's large water surface. Good ventilation remains essential to prevent stagnant air, which favours skin problems.

What substrate should be chosen for the land area?▾

An easy-to-clean substrate such as absorbent paper, cypress mulch, or coconut fibre works well, as this species soils its environment heavily. Avoid aspen, which moulds easily on contact with ambient humidity.

What does it eat, and what dietary precautions should be taken?▾

It's a piscivore/amphibian-eater that feeds on fish and frogs, sometimes accustomed to fish-scented rodents. Absolutely avoid fish rich in thiaminase (goldfish, smelt), which cause a vitamin B1 deficiency: favour trout, tilapia, capelin, or silverside, and feed it outside the main tank to limit accidental bites and water contamination.

Why is water quality so important for this species?▾

Because it often defecates and feeds directly in the water: effective filtration and/or frequent water changes are essential to prevent skin infections, the water needing to stay clean at all times and the tank needing regular cleaning and disinfection.

Does it need UVB?▾

It's not strictly essential for this colubrid, but a low UVB (UV index 1-2, T5 5% tube) is beneficial for this diurnal, semi-aquatic species that likes to bask on its platform, paired with a regular day/night cycle.

What is its life expectancy?▾

On average 10 to 15 years, but well-kept individuals can exceed that range and reach fifteen to twenty years in captivity.

How does it reproduce?▾

It's ovoviviparous and very prolific, with litters of 10 to 50 newborns. Breeding is generally triggered by winter brumation (cooling to 12-16 °C for several weeks) followed by spring warming, with births occurring in late summer.

What health issues should be watched for?▾

The most common are skin infections and scale rot linked to dirty water or an environment that's too humid and poorly ventilated, internal parasitism (especially in wild-caught specimens), thiamine deficiency from a diet too heavy in thiaminase-rich fish, and respiratory infections from unsuitable temperature or humidity.

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