How to Breed Discoid Roaches: A Complete Colony Guide

I've run feeder colonies for years, and breeding your own discoid roaches (Blaberus discoidalis) is the single best money-saver in the hobby once you keep more than one insectivore. A single adult bearded dragon can put away 15–20 discoids a week. Add a leopard gecko, a chameleon, or a monitor and you're placing feeder orders every week or two, forever. A breeding colony ends that: after the setup cost and a few months of patience, you have a self-sustaining supply in every size, on demand, that you control top to bottom.

That last part matters more than the savings. When you breed your own, you decide exactly what the roaches eat — and what the roaches eat becomes what your reptile eats. This guide is the full build: the bin, the heat, the starter stock, sexing, the breeding timeline, what to feed, and how to fix a colony that's stalled. If you only want care basics for roaches you've already bought, see my discoid roach keeping playbook instead. This guide is about making more of them.

Why breed instead of buying

Three reasons, in order of how much they'll matter to you:

• ◆Cost. Feeder orders are a recurring tax on keeping insectivores. A colony pays for itself within months for anyone running multiple animals.
• ◆Control over nutrition. You gut-load your own breeders, so you know precisely what's inside the feeders your animals eat. No mystery diet, no shipping stress degrading them.
• ◆Size on demand. A producing colony gives you overlapping generations — pinhead nymphs for a baby gecko and two-inch adults for a monitor, from the same bin, the same day.

The honest trade-off: breeding takes space, patience, and a tolerance for keeping a few hundred roaches in your home. If you keep one animal and like ordering as needed, that's completely valid. If you keep several, a colony is one of the most rewarding setups in the hobby.

What you need to get started

The container

Use a large opaque plastic storage bin — 40 gallons minimum for a real breeding colony. Bigger is better: more surface area, better airflow, more room to grow into. Sterilite and Rubbermaid bins are cheap and perfect. The interior walls must be smooth, because discoids can't climb smooth plastic — the bin itself is escape-proof for adults. Opaque is deliberate, too: discoids want dark, and a dark bin keeps them calm and breeding.

Ventilation

Cut two large rectangular windows in the lid — roughly 6×12 inches each — and hot-glue fine aluminum or fiberglass mesh over them. This is non-negotiable. A sealed bin traps humidity and grows mold and grain mites within weeks. Just as important: fine mesh, not drilled holes or coarse screen, because newborn nymphs are pinhead-sized and walk straight through anything coarser. Get the mesh right once and you'll never find a roach loose in the room.

Hides: egg flats

Stack cardboard egg flats vertically inside the bin — 8–12 flats for a 40-gallon setup. Vertical flats multiply the usable living space several times over, give the roaches the dark hiding spots they crave, and let frass fall to the floor instead of caking on surfaces. When it's time to harvest, you lift a flat and shake off the size you want.

Heat source

Temperature is the most critical factor in the whole build, so spend here. You need a reliable way to hold 85–95°F inside the bin:

• ◆Heat mat mounted on the side of the bin (never underneath) with aluminum tape. Side-mounting is essential — discoids cluster low, and bottom heat cooks exactly that zone and can wipe a colony out from below.
• ◆Ceramic heat emitter on a clamp lamp above the bin, run through a thermostat.
• ◆Heat cable or tape wrapped around the exterior for larger setups.

Always run heat on a thermostat, or at the very least monitor it with a thermometer. Overheating kills roaches fast, and an unregulated mat in a warm room will overshoot. A thermostat with the probe in the warm zone, set around 90°F, is the best $20–30 in the whole project.

Your starter colony

You need breeding-age adults to begin. A solid start is 50–100 mixed adults at a ratio of roughly 1 male per 3–5 females, ideally with some mixed-age nymphs included to stagger future generations. Buying a ready-sexed starter colony is the fastest way to skip months of waiting. When you're seeding a new bin or topping up a thin one, All Angles Creatures stocks healthy, well-started discoid roaches in colony and feeder sizes.

Sexing adults

Sexing is easy once they reach their final molt:

• ◆Males: full-length wings that completely cover the abdomen; sleeker, more streamlined body; slightly smaller overall.
• ◆Females: short wing stubs leaving most of the abdomen exposed; wider, rounder, heavier body; larger overall.

Nymphs can't be reliably sexed until that final molt into adulthood, around 4–6 months of age.

Temperature for breeding

This deserves its own section because it decides everything. Here's how output maps to temperature:

Hold the warm zone 24/7 — don't let the bin cool significantly at night, which is the silent productivity killer in cold rooms. Leave the far end of the bin cooler so the roaches can self-regulate by moving toward or away from the heat. Before you change anything about a sluggish colony, put a thermometer in the warm zone and read it. Nine times out of ten, "it's not breeding" means "it's colder than you think."

Feeding your breeding colony

Breeding females have higher demands than idle roaches — egg production and nymph development both run on protein. A working menu has four parts:

• ◆Protein base, always available. Commercial roach chow, ground high-quality dry dog food, or fish flakes. This drives reproduction.
• ◆Fresh produce, rotated. Carrots, squash, sweet potato, dark leafy greens, apple. Moisture, vitamins, and enrichment.
• ◆Dry grains. Rolled oats, wheat bran, chicken feed for carbohydrates and fiber.
• ◆Water crystals, always. Never an open dish — nymphs drown in standing water. Use small crystals so tiny nymphs aren't trapped.

Pull uneaten fresh food within 48 hours so it doesn't mold. Keep the dry base and water crystals topped up at all times. Remember the gut-loading principle: for 24–48 hours before you feed roaches off, load the colony with rich produce and protein so the feeders you harvest are packed with nutrition at the moment your animal eats them.

The breeding timeline

Patience is the whole game. From a start of 50–100 adults, here's a realistic arc:

• ◆Weeks 1–2 — acclimation. Roaches adjust. Little to no breeding. Resist the urge to fiddle.
• ◆Weeks 3–6 — breeding begins. Females mate and start carrying egg cases (oothecae) internally. Discoids are live-bearers, so there's no exposed egg case to dry out or manage.
• ◆Weeks 6–14 — first nymphs. Gestation runs about 60 days; tiny white nymphs appear at the bottom of the bin.
• ◆Months 3–6 — acceleration. First-generation nymphs grow while adult females keep producing. You can begin light harvesting toward the end of this window.
• ◆Months 6–12 — equilibrium. First-generation nymphs reach adulthood and start breeding themselves. The colony becomes self-sustaining for one or two reptiles.

For a larger collection, start with more adults or — better — run multiple bins in parallel.

Nymph care

Nymphs stay in the same bin as the adults; there's no meaningful risk of adults eating them. Just make sure:

• ◆Small water crystals are available (large ones can trap tiny nymphs).
• ◆Food sits at floor level — nymphs can't climb egg flats to reach food placed on top.
• ◆Temperature stays steady — nymphs are more sensitive to cold than adults.
• ◆Ventilation is good — nymphs are more vulnerable to mold-related problems.

Troubleshooting a struggling colony

Work the causes in order of likelihood:

• ◆No nymphs? Check temperature first — it's the cause about 90% of the time. Confirm the warm zone is genuinely 85–95°F and holding overnight. Then verify you have both sexes, that protein is available, and that 8+ weeks (one full gestation cycle) have passed.
• ◆High nymph mortality? Usually dehydration — tiny nymphs dry out fast and need constant water crystals. Also check for grain mites, which overwhelm small nymphs.
• ◆Mold in the bin? Too wet, too little air. Remove rotting food, add ventilation, and cut back on high-moisture produce temporarily.
• ◆Slow growth? Nudge the warm zone toward 90°F and make sure the dry protein base is always available.

Scaling up

The breeder's "secret" is just deliberate scaling. Run two or three medium bins instead of one giant tub — they're easier to ventilate and harvest, and they give you redundancy if one crashes from a failed thermostat or a mite bloom. Keep a breeder bin you crop lightly and a feeder bin you harvest hard, then rotate. Start a new bin from the surplus of an established one before you're desperate for it, so you always have a colony in peak production while another builds.

The short version

Use a 40-gallon-plus opaque bin with fine-mesh ventilation and vertical egg flats, hold 85–95°F on a thermostat 24/7, start with 50–100 sexed adults, feed protein plus rotated produce with water crystals, and be patient for 4–6 months. Do that and the colony becomes the most boring thing in your animal room — which, for a feeder operation, is exactly the goal.

New to roaches? Start with my discoid roach care playbook, or browse the full exotic-animals care library for the rest of the feeder lineup. The University of Florida's entomology and nematology department is a good non-commercial reference for feeder-insect husbandry and regional regulations.