Dubia Roaches

🔤 Taxonomy

Blaptica dubia is the currently accepted scientific name for the dubia roach. GBIF lists older synonyms including Blabera claraziana and Blabera ligata.

English common names used in the hobby:

• Dubia roach
• Orange-spotted roach
• Guyana spotted roach
• Argentine wood roach

📌 Description

Dubia roaches (Blaptica dubia) are medium to large, live-bearing cockroaches widely cultured as feeder insects for reptiles, amphibians, tarantulas, and other insect-eating animals. They are quiet, do not jump, produce less smell than neglected cricket tubs, and cannot climb clean smooth plastic or glass.

Adults usually reach about 4-5 cm. Males have full wings but are poor flyers; females are heavier, darker, and have only short wing pads. Nymphs are the usual feeder size because they are softer, smaller, and easier to match to the predator.

They are useful feeders, not a complete diet by themselves. Use them as part of a varied feeder rotation and gut-load them before feeding.

🌍 Distribution

The species is native to warm parts of southern South America. Documented and commonly reported range records include Argentina, Brazil, Paraguay, and Uruguay.

In nature, dubia roaches live in warm, sheltered microhabitats with decaying plant material, bark, leaf litter, and access to moist food. Captive colonies work best when they copy the useful parts of that habitat: warmth, darkness, vertical hiding surfaces, dry airflow, and fresh moisture from food.

Never release feeder roaches outdoors. Even species that breed poorly in cool homes can survive transport, contaminate local environments, or become a legal problem in warm climates.

⚖️ Regulations and safety

Blaptica dubia is not listed in the CITES Appendices in the official CITES checklist reviewed for this guide. No specific EU wildlife trade Annex listing was found for the species.

The EU Invasive Alien Species Regulation restricts species on the Union list; Blaptica dubia is not treated here as a Union-list species. That does not mean it is legal everywhere. National, regional, biosecurity, import, transport, school, workplace, landlord, and animal-feed rules may still restrict live cockroaches.

The Bern Convention is not normally relevant because this is not a European native protected species. Keep colonies securely, do not release surplus animals, and check local rules before buying, selling, shipping, or breeding live roaches.

🤌 Husbandry

A simple, productive colony needs four things: warmth, dry airflow, dark hiding space, and clean food. A ventilated plastic storage tub is usually more practical than an aquarium because it is light, escape-resistant, and easy to clean.

For a small starter colony, use a tub around 40-60 l. Large colonies need more floor area and more vertical egg-crate surface so the roaches are not crowded.

Good colony setup:

• Smooth-sided plastic tub with a tight lid
• Wide ventilation panels covered with fine metal or fiberglass mesh
• Vertical egg crates or cardboard drink trays
• Dry floor with no loose wet bedding
• Food dish or tray that can be removed for cleaning
• Moist food placed where it will not rot inside the hides

Keep colonies away from pesticides, aerosols, cleaning fumes, and direct sun. Do not mix dubia roaches with wild-caught roaches or unknown feeder insects.

💡 Lighting

Dubia roaches do not need UVB or bright light. They breed better in dark, sheltered conditions and usually hide when exposed.

A normal room day-night rhythm is enough. If the colony is kept in a heated rack or cabinet, make sure the heat source is controlled and the container still gets airflow.

🌡 Heating and temperature

Dubia roaches survive at ordinary room temperatures, but breeding slows down sharply when they are cool. Productive colonies do best with a warm area around 28-32°C.

Recommended ranges:

• Productive warm zone: 28-32°C
• Acceptable maintenance range: 24-28°C
• Cool slowdown: below about 22°C
• Avoid: sustained heat above 35°C

Use a thermostat with heat mats, heat cable, ceramic emitters, or heated racks. Heat one side or the back of the tub instead of cooking the whole container. A colony that cannot move away from heat can overheat quickly.

💧 Humidity and water

The colony should be dry and ventilated, but the roaches need a safe moisture source. Most keepers provide moisture through fresh vegetables and fruit rather than open water.

Good moisture sources:

• Carrot
• Squash
• Sweet potato
• Apple
• Orange
• Leafy greens

Remove wet food before it molds. Open water dishes drown nymphs and create bad hygiene. Water gels can be used temporarily, but they still need regular replacement.

🌿 Enclosure and decoration

Egg crates are the main furniture. Stack them vertically so frass falls down and air can move between layers. Horizontal stacks trap moisture and become dirty faster.

Clean the tub when frass, dead roaches, shed skins, or old food build up. Do not sterilize the colony every week; overcleaning removes nymphs and disrupts breeding. Instead, clean in sections and transfer egg crates carefully.

Escape prevention:

• Keep ventilation mesh intact and securely fixed
• Do not let egg crates touch the lid
• Use smooth tubs, not scratched rough plastic
• Add a petroleum-jelly barrier near the upper inside rim if needed
• Sort roaches in a secondary bin

🪳 Feeding

Feed the colony a dry base plus fresh plant foods. The goal is healthy roaches and safe gut-loading, not fast growth from spoiled, greasy, or high-protein waste.

Good dry foods:

• Roach chow from a reputable source
• Ground whole-grain cereal in moderation
• Bee pollen or alfalfa-based insect diets in moderation
• Dry leafy herb mixes

Good fresh foods:

• Carrot, squash, sweet potato
• Dark leafy greens
• Apple, orange, mango, or banana in small amounts
• Edible vegetable scraps that are clean and pesticide-free

Avoid:

• Moldy food
• Onion-heavy scraps
• Salty, oily, seasoned, or cooked leftovers
• Dog/cat food as a main diet for feeders
• Food from pesticide-treated plants

Gut-load roaches for 24-48 hours before feeding them to reptiles or amphibians. Use fresh greens and vegetables, then dust feeders according to the predator species’ calcium and vitamin schedule.

🥚 Breeding

Dubia roaches are live-bearing in normal colony conditions. Females carry the ootheca internally and give birth to nymphs after a long gestation period. Warm, stable colonies usually produce steadily rather than in sudden explosive batches.

A practical starter group is one male for three to five adult females, plus mixed nymph sizes. Too many males waste space and stress females.

Breeding slows when:

• Temperatures are too low
• The colony is crowded
• Food or moisture is inconsistent
• Old food molds
• There are too few adult females
• The colony is disturbed too often

Let a new colony establish before harvesting heavily. Feed off surplus males and medium nymphs first, and keep enough females and young nymphs to replace breeders.

🩺 Common problems

• Mold: too much wet food, poor ventilation, or horizontal egg crates
• Die-offs: overheating, pesticide exposure, fumes, dehydration, or spoiled food
• Mites: excess moisture and decaying food
• No breeding: cool temperatures, too few females, stress, or overharvesting
• Bad smell: dead insects, mold, wet frass, or rotten food
• Escapes: damaged lid, rough plastic, egg crates touching the top, or sorting without a second bin

If roaches from a colony are repeatedly causing illness, refusal, or abnormal droppings in the animals eating them, stop using that colony and review hygiene, diet, pesticides, and veterinary advice for the predator animal.

📌 Conclusion

Dubia roaches are one of the easiest feeder colonies to maintain when they are kept warm, dry, ventilated, dark, and clean. Their main risks are poor hygiene, bad gut-loading, overheating, and careless escape control.

Treat the colony as part of the animal’s nutrition system. Healthy feeder insects make better food than neglected feeder insects.

📚 Sources and further reading

• GBIF: Blaptica dubia taxonomy
• CITES Appendices
• European Commission: Invasive alien species
• Lam et al. 2018: Nutrient composition of Blaptica dubia