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White Shark Isopods (Cubaris sp.)
£12.50
£40.00
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White Shark Isopods (Cubaris sp. 'White Shark') are a delightful dwarf Cubaris species that pack incredible visual appeal into a tiny package. Originating from Thailand, these miniature isopods display a striking tricolour pattern - orange, white, and dark blue-black sections arranged in sequential bands that make them genuinely eye-catching despite their diminutive size.
Don't let the intimidating name fool you - at just 8mm fully grown, these are among the smallest Cubaris species available. What they lack in size, they more than make up for in personality, colouration, and breeding potential. Once established, White Sharks are surprisingly prolific and make an excellent gateway species for keepers wanting to move from beginner isopods into the world of Cubaris.
Their distinctive appearance has earned them cult status in the hobby. The combination of a bright orange "face," white midsection, and dark rear creates a pattern unlike almost any other isopod. Some individuals show variations where the black appears more navy blue, or the orange leans towards red - genetic variation that adds interest to any colony.
A Glimpse
Origin: Thailand
Scientific Name: Cubaris sp. 'White Shark'
Difficulty Level: Easy to Medium
Size: Up to 8mm (dwarf species)
Temperature: 24-28°C
Humidity: 60-80%
Rarity: Low to Medium
An Overview
White Shark Isopods belong to the Cubaris genus - a group renowned for attractive colouration, the characteristic "duck face" appearance, and the ability to roll into a perfect ball when threatened. While many Cubaris species carry reputations for being difficult and expensive, White Sharks are refreshingly accessible. They're one of the few Cubaris that combine stunning looks with genuinely beginner-friendly care.
Their small size is the first thing keepers notice. Fully grown adults reach approximately 8mm (around 1/4 inch), making them true dwarf isopods. This compact size makes them perfect for smaller terrariums where larger species would overwhelm the space. Despite being tiny, established colonies are surprisingly visible - particularly at feeding time when they'll swarm a piece of carrot or vegetable.
White Sharks originate from tropical Thailand, where they inhabit humid environments rich in decomposing organic matter. They've adapted to life in consistently moist conditions with high lime content in the soil - important considerations when setting up their enclosure.
One of their best qualities is their breeding potential. Unlike some Cubaris species that are notoriously slow or difficult to breed, White Sharks reproduce readily once established and comfortable. A small starter colony can multiply significantly within 2-3 months under proper care.
Basic Care
White Shark Isopods require typical Cubaris care: warm temperatures, high humidity, and attention to environmental stability. They're more forgiving than premium Cubaris species like Rubber Duckies but still need proper conditions to thrive.
Temperature should be maintained between 24-28°C (75-80°F). Consistent warmth encourages activity and breeding. Avoid temperature fluctuations where possible.
Humidity is crucial - aim for 60-80%. The enclosure should be kept predominantly moist (approximately 80% damp, 20% drier), but never waterlogged. Too much dampness causes moulting issues and sudden die-offs, a common problem with Cubaris species. The key is maintaining humidity without creating soggy conditions.
Unlike some Cubaris that prefer very low ventilation, White Sharks benefit from moderate airflow. Small ventilation holes help prevent stagnation and mould while maintaining necessary humidity levels. Too little ventilation causes problems; too much drops humidity too quickly. Finding the balance is important.
Provide a deep substrate (7-10cm / 3-4 inches) to allow for their natural burrowing behaviour. White Sharks are enthusiastic burrowers and spend much of their time beneath the surface, particularly when preparing to moult or breed.
A smaller enclosure is actually preferable when starting with a new colony. Being dwarf isopods, if they're too spread out in a large space, they'll struggle to find each other for breeding. A 6-8 quart container is ideal for a starter culture of 10-20 individuals.
Feeding
White Shark Isopods are detritivores with hearty appetites relative to their tiny size. They require a high-nutrition diet to support their active metabolism and breeding.
Primary foods (should always be available):
Hardwood leaf litter (oak is excellent)
Rotting white wood pieces
Sphagnum moss
Lichens and forest moss
Supplementary foods (offered regularly, at least twice weekly):
Fresh vegetables - carrots, courgette, cucumber, squash
Fish food/flakes
Dried shrimp, minnows, or insects (protein source)
Commercial isopod foods
Calcium and protein supplementation is particularly important for this species. White Sharks are notably protein-hungry compared to some isopods. Provide constant access to:
Cuttlefish bone
Limestone powder or pieces
Crushed oyster shell
Eggshells
Adding limestone to the enclosure mimics their natural Thai habitat, where they live in high lime-content soils.
A useful observation tip: placing a small piece of carrot in the enclosure will quickly become "caked" with White Sharks feeding - adults and babies alike. This is an excellent way to observe your colony without disturbing them by digging through the substrate.
Feed protein sources on the drier side of the enclosure, as they spoil quickly in humid conditions and can attract pests.
Appearance and Behaviour
White Shark Isopods are instantly recognisable for their striking tricolour pattern. From front to back, they display sequential bands of colour: a bright orange "face" and head region, a white midsection, and a dark blue-black rear section. This creates a visually striking contrast that's genuinely impressive despite their tiny size.
Colour intensity and exact patterning varies between individuals due to natural genetic variation. Some specimens show more navy blue than black, others lean towards red-orange rather than pure orange. This variation adds visual interest to colonies.
Adults reach approximately 8mm in length - true dwarf status among isopods. Their bodies show the characteristic rounded, segmented shape of Cubaris species with the adorable "duck face" that makes the genus so popular.
Behaviourally, White Sharks are shy and reclusive, spending much of their time burrowed in the substrate. They're primarily nocturnal, doing most of their foraging at night, though established colonies will venture out during the day - particularly when food is available.
Like all Cubaris, they can roll into a tight, complete ball (conglobation) when threatened. When disturbed, they tend to scatter quickly and seek hiding spots rather than curling up immediately.
They're social creatures that do well in groups. High-density colonies are actually more active and visible than sparse ones, as the isopods feel more secure with others around.
Habitat
White Shark Isopods originate from tropical Thailand and require conditions that replicate their humid, warm native environment.
For housing, use a plastic container with ventilation or a glass terrarium. Smaller containers (6-8 quart) are actually preferable for starter cultures - dwarf isopods in large spaces take longer to find each other and begin breeding.
Temperature: Maintain 24-28°C consistently. Warmth encourages activity and reproduction.
Humidity: Aim for 60-80%, with approximately 80% of the enclosure kept moist and 20% drier. High humidity is essential, but avoid waterlogged conditions.
Ventilation: Moderate. Small ventilation holes help prevent stagnation and mould while maintaining humidity. A secure lid with mesh-covered vents works well.
Substrate depth: Provide 7-10cm (3-4 inches) minimum to allow comfortable burrowing. White Sharks are enthusiastic burrowers and spend considerable time beneath the surface.
Hiding spots: Unlike some Cubaris that congregate under cork bark, White Sharks typically prefer burrowing in the substrate itself. Piles of leaf litter and decaying wood provide cover without requiring cork bark (though it can be included if desired).
Avoid direct sunlight and extreme temperature fluctuations.
Substrate Mix
Creating the right substrate is essential for White Shark success. The mix provides food, maintains humidity, allows burrowing, and should include calcium-rich elements to mimic their natural habitat.
Option 1 - ABG Mix Base:
ABG (Atlanta Botanical Garden) mix provides an excellent foundation with good drainage, water retention, nutrient retention, and compaction resistance.
Standard ABG mix components:
Sphagnum moss - 1 part
Tree fern fibre - 2 parts
Orchid bark - 2 parts
Peat moss - 1 part
Charcoal - 1 part
Layer on top: oak leaf litter, cottonwood bark, live moss
Option 2 - Alternative Mix:
Coconut humus/coir
Mixed soil
Wooden bark pieces
Orchid moss
Sphagnum moss
Essential additions to either mix:
Limestone powder (mimics their high-lime Thai habitat)
Cuttlefish bone pieces
Rotting white wood
Generous leaf litter covering
Create a thick substrate base (7-10cm minimum) to support their burrowing behaviour. The substrate should feel damp when squeezed but not dripping wet.
Adding decaying wood pieces, cork bark, and piles of leaf litter helps with excess moisture control and provides food sources.
Breeding
White Shark Isopods are among the more prolific Cubaris species once established. They breed readily under proper conditions, making them an excellent choice for keepers wanting to build a colony.
New colonies typically need about a month to acclimate to their environment before breeding begins. During this settling-in period, focus on maintaining stable conditions and don't expect immediate reproduction.
Once established, White Sharks can multiply quickly. A starter colony of 10-12 individuals can grow significantly within 2-3 months under optimal care. They're described as "fairly prolific on a regular basis" once conditions are right.
For optimal breeding success, maintain temperatures at the higher end of their range (26-28°C), keep humidity at 60-80%, provide deep substrate for burrowing, ensure constant calcium availability, and offer regular protein supplementation.
Females carry fertilised eggs in a brood pouch (marsupium) until they hatch. The tiny mancae can be raised alongside adults without separation, though some keepers prefer to move juveniles to prevent any risk of predation in crowded conditions.
Monitor colony size as breeding progresses. White Sharks reproduce well, and populations can grow quickly. Be prepared to upgrade enclosure size or split colonies as numbers increase.
White Shark Isopods as Bioactive Cleanup Crew
White Shark Isopods make excellent additions to bioactive terrariums, efficiently processing organic waste despite their small size. Their diminutive stature actually makes them well-suited to smaller terrariums where larger isopod species would be overwhelming.
As detritivores, they eagerly consume leaf litter, decaying wood, leftover food, faecal matter, and decomposing plant material. This natural cleanup behaviour helps maintain enclosure hygiene and reduces mould risk.
Their high breeding rate means colonies can sustain themselves as a cleanup crew while potentially providing a calcium-rich food source for small terrarium inhabitants that can safely consume them.
For bioactive use, ensure the enclosure provides appropriate humidity and temperature for White Sharks while meeting the needs of other inhabitants. Their preference for burrowing means they'll spend much time in the substrate, aerating it while processing organic matter.