Cubaris White Shark isopods (Cubaris sp. "White Shark") are a small, sought-after tropical isopod from Thailand, prized for their striking tricolour look - a black-and-white body with a red-orange face and a soft, brushed, almost scaly sheen. Like other Thai Cubaris, they're land animals from limestone cave country, wanting a warm, humid, well-ventilated enclosure with a deep organic substrate to burrow into, plenty of leaf litter, and a source of limestone or calcium. They're a slow-to-establish breeder that becomes prolific once mature. This guide explains how to keep them well.
One thing to clear up first, because the name causes confusion: despite the "shark" tag, these are entirely terrestrial isopods. They do not live in water, don't need an aquarium, and there are no water parameters, pH or filtration to worry about. Like all woodlice they breathe air through gill-like structures that simply need to stay damp, so the aim is a humid land enclosure, not a tank of water.
About Cubaris White Shark Isopods
"White Shark" is a small, rare dwarf Cubaris from Thailand, instantly recognisable by its tricolour pattern of black, white and orange-red, with a subtle brushed look to the darker areas. It's a genuinely dwarf species - most adults reach only around 0.8-1 cm, though some sources report a little larger - and they live for roughly 1-2 years. Like others in the family Armadillidiidae, they can roll into a ball when threatened. They come from limestone karst caves and the humid forest floor around them, sheltering among rocks, decaying wood and leaf litter. Peaceful, secretive detritivores that burrow readily, they're kept mainly for their looks, though they make a tidy cleanup crew too. Understanding that warm, humid, calcium-rich cave origin is the key to keeping them.
Setting Up the Enclosure
A secure, well-ventilated tub or terrarium with a tight-fitting lid works well - a clip-lock box is ideal for a starter culture. As with all Cubaris, the balance between holding humidity and keeping the air fresh matters:
- Good ventilation. White Sharks like decent airflow, so provide ventilation holes, ideally on opposite sides for cross-ventilation. Stagnant, stale air is a common cause of Cubaris colony crashes - aim for fresh air without letting the enclosure dry out.
- Deep substrate. These are burrowers, so give them a deep, moisture-retaining organic layer (ideally around 7-10 cm). A mix of organic topsoil, crumbled white rotten hardwood and leaf litter lets them dig and creates a humidity gradient, damper below and drier on top. The substrate and leaf litter also form part of their diet.
- Hides. Add cork bark, wood, moss and a good covering of leaf litter for cover. Since they spend much of their time burrowing, deep substrate matters more than elaborate surface décor - some keepers find this species actually prefers burrowing to using cork hides.
The Limestone Point
This is the one thing most often missed with Thai Cubaris. Coming from limestone caves, White Sharks benefit greatly from a calcium source in the enclosure - pieces of limestone, crushed oyster shell or cuttlebone. It provides the calcium they need for healthy moulting, and many keepers find their Cubaris are more settled and breed better when limestone is present. For this species it's best thought of as habitat enrichment, not just a supplement.
Temperature and Humidity
White Sharks like it warm, humid and stable. Aim for moderate room temperature, broadly 22-27°C, and high humidity around 70-80%. Consistency is the priority - Cubaris don't cope well with sudden swings - so avoid sharp changes in temperature or moisture. In most homes they'll sit happily at room temperature without extra heating; if some warmth is ever needed, a low-wattage heat source on one side (creating a gentle gradient) is far better than a heat lamp, which overheats and dries them out. Keep humidity up by misting with dechlorinated water as needed and maintaining the damp-to-dry substrate gradient, while keeping that ventilation. They're mostly nocturnal and like dark, secluded spots, so no special lighting is needed.
Feeding
White Sharks are detritivores, not hunters - their diet is built on decaying leaf litter and rotting wood, which should always be available. Supplement with the occasional slice of vegetable or fruit (carrot, courgette, cucumber, sweet potato, a little apple or banana) and, importantly for this species, a little extra protein a couple of times a week - freeze-dried shrimp, dried insects, fish flakes or a specialist isopod food. Always keep a calcium source topped up. Offer fresh food in small amounts and remove anything uneaten before it moulds, since the warm, humid setup is prone to mould if food sits too long.
Breeding: Slow to Establish, Then Prolific
Here's where expectations matter. Like other Cubaris, White Sharks are slow to get going - a culture takes time to establish - but once mature and settled, a healthy colony becomes genuinely prolific. So patience early on is the key, and there's no rush over enclosure size; overcrowding isn't a near-term worry.
They have separate sexes and reproduce sexually. After mating, the female carries her fertilised eggs in a fluid-filled brood pouch (the marsupium) on her underside until they hatch into mancae - tiny, fully formed versions of the adults - which then grow through a series of moults. There's no need to separate the young; in a well-provided enclosure they live happily alongside the adults. The recipe for breeding success is simply excellent, consistent husbandry: steady warmth and humidity, good ventilation, a calcium source, deep substrate and leaf litter, and minimal disturbance. Keep a single species per enclosure.
Frequently Asked Questions
Do Cubaris White Shark isopods live in water?
No - despite the "shark" name, they're fully terrestrial cave isopods from Thailand. They live on land in a humid enclosure and need no aquarium, water dish, pH balancing or filtration. They breathe air through gill-like structures that simply need to be kept damp.
Are Cubaris White Shark isopods good for beginners?
They're a moderate species - not difficult once their needs are met, but as a slower-establishing Cubaris with specific humidity, ventilation and limestone requirements, they suit keepers with a little experience. Hardier isopods make a better first colony.
Do Cubaris White Shark isopods need limestone?
They strongly benefit from it. Coming from limestone caves, they need a calcium source - limestone, crushed oyster shell or cuttlebone - for healthy moulting, and many keepers find it improves how settled they are and how well they breed.
What temperature do Cubaris White Shark isopods need?
Moderate and stable, around 22-27°C. The key is consistency, as they don't cope well with sudden swings, so avoid heat lamps and big fluctuations. Most homes provide a suitable room temperature without extra heating.
How big do Cubaris White Shark isopods get?
They're a dwarf species - most adults reach only around 0.8-1 cm, making them one of the smaller Cubaris in the hobby. Their compact size and bright tricolour pattern are a big part of their appeal.
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