A hardy, long-lived semi-aquatic newt with rough dark brown-to-black skin and a vivid orange-to-red belly that warns of its toxic skin. Cooler temperatures and clean water make it a rewarding species, though its toxins mean strict hand-washing and no handling near the face.
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Educational only. KinStation content is reviewed by licensed veterinarians but cannot replace an in-person exam. Always consult a licensed veterinarian or board-certified specialist for diagnosis, treatment, or any decision affecting your pet's health.
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Small: 3.5 to 5 in (9 to 13 cm) total length; females larger than males
Lifespan
10–25 years
Social needs
group
Native region
Japan (native to the main islands)
Origin
Old World
Climate
🍂 Temperate
Water type
💧 Freshwater
Family
Salamandridae
Genus
Cynops
Part of the Newts
Semi-aquatic salamanders kept in cool, clean, planted aquatic setups with land access. Many have toxic skin, so they are observation animals that require careful hand-washing and no casual handling. Many genera are now restricted in US trade under Lacey Act Bsal-fungus rules.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Semi-aquatic newt tank
10-gal (20 × 10 × 12 in) for a pair
Cynops pyrrhogaster is a primarily aquatic newt. 10-gal tank with mostly water (~80%), gentle filter, dense plants, cork-bark land area, cool water (60–70 °F). Toxic skin secretion — wash hands after contact and don't co-house with fish.
Photo coming soon
Recommended
Larger planted newt tank
20-gal long for a small group
Wider tank with mostly water, gentle filtration, dense plants (Anubias, Java fern, Elodea), small land area, cool water. Japanese fire-bellies tolerate small same-sex / sex-matched groups.
Photo coming soon
Ideal
Bioactive paludarium
29 gal planted paludarium
Heavily planted paludarium with cool water section, gentle filter, dense plants, sphagnum land area, and a cool ambient (60–68 °F). Conservation note — wild populations declining; prefer captive-bred animals.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Amphibian eggs are soft, jelly-coated spheres laid in or near water — in floating clutches, strings, or foam nests depending on the species. The dark embryo is visible within the clear gel as it develops.
Photo coming soon
Tadpole / Larva
The aquatic larva (a tadpole in frogs/toads, a gilled larva in salamanders and newts) breathes through gills and feeds and grows in water. Frog/toad tadpoles are limbless at first, then sprout hind then front legs as metamorphosis nears.
Photo coming soon
Juvenile (froglet / eft)
At metamorphosis the animal develops legs and lungs and typically leaves the water as a froglet or, in many newts, a terrestrial eft. It resembles a small adult but is not yet sexually mature and its coloration may still be changing.
Adult
Adults reach full size and breeding condition, with the species' mature skin coloration and pattern. Many amphibians return to water to breed and can show seasonal or sex-specific changes such as nuptial coloration or crests.
Habitat & enclosure
Keep in an aquatic-leaning paludarium or an aquarium with a land area; a 10 to 20 gallon (38 to 75 L) tank suits a small group. Provide water 6 to 10 in (15 to 25 cm) deep with gentle flow, plus easy land access via cork bark, rocks, or floating platforms, since adults spend much time in water but must be able to climb out. Keep cool: 60 to 72 F (16 to 22 C), ideally below 75 F (24 C); sustained heat above the mid-70s F is dangerous. Use dechlorinated water, pH near neutral, and dense planting with hides. A tight lid is essential as they climb and escape.
Substrate
Use either a bare bottom for easy cleaning or large, smooth river stones or sand too coarse or too fine to be swallowed; avoid gravel small enough to cause impaction. Provide live or silk plants and abundant hides both in water and on the land area.
Equipment & setup
Use a gentle filter (sponge or baffled) since they dislike strong current, and a reliable thermometer. Most importantly, plan for cooling: keep the tank in a cool room, use a fan across the water surface or a chiller in warm climates, and avoid heaters. A secure, fully covered lid prevents escapes. Subdued lighting and live plants improve comfort.
Diet
Carnivorous. Feed earthworms (chopped to size), bloodworms, blackworms, daphnia, brine shrimp, small snails, and aquatic newt pellets. Offer food every 2 to 3 days, scaling portions to body condition. Variety prevents nutritional gaps; gut-load or supplement live foods. Remove uneaten food promptly to protect water quality.
Behavior & temperament
Peaceful, slow-moving, and active by day in cool water. The bright belly is aposematic, and the skin contains tetrodotoxin, so it is mildly toxic if ingested and an irritant to mucous membranes. This is not a handling animal: handle only when necessary with wet, clean hands, never touch your eyes or mouth, and wash thoroughly afterward. They cohabit peacefully in groups of similar size.
Health
The main threat is heat stress; overheating causes fungal infections, refusal to feed, and death. Other issues include bacterial/fungal skin infections, bloat, and poor water quality. Maintain cool, clean, well-filtered water with gentle flow. Avoid copper medications. Quarantine new arrivals; many are wild-caught and benefit from parasite screening and a recovery period.
Tips, DIY & hacks
Temperature control is the make-or-break factor; if your home gets warm, commit to a fan or chiller before keeping this species. Always dechlorinate water and rinse hands well after any contact because of the skin toxins. Provide reliable land access so newts can leave the water. They can live for decades, so treat them as a long-term commitment.
