How to start an isopod colony: the first 90 days
A beginner's setup for an isopod culture — bin, substrate, leaf litter, moisture gradient, food — and what to expect in the first three months.
Draft — under review. A starter culture of 10–15 isopods becomes a colony of hundreds inside a year if the first three months go right. This is the setup most US breeders use, scaled down to one bin.
1. The bin
A 6-quart (or similar) plastic shoebox with a lid. Drill or melt a row of small ventilation holes along one short side near the top, and a few on the opposite side low down for cross-flow. More ventilation for dry-loving Porcellio; less for humid Cubaris.
2. Substrate and leaf litter
Two to three inches of a loose organic mix — coco fiber or topsoil, rotting hardwood, and a handful of sphagnum — topped with a thick layer of sterilized hardwood leaf litter (oak, magnolia, maple). Leaf litter is the staple food, not decoration; keep it deep. Add a piece of cork bark or egg crate as a hide.
3. The moisture gradient
Keep one end damp (mist it, add moss) and the other end dry. Isopods regulate themselves by moving between the two; a bin that is wet everywhere kills more colonies than any other mistake.
4. Food and calcium
Beyond leaf litter: a slice of vegetable or a pinch of fish flakes once or twice a week, removed before it molds, and a permanent calcium source (cuttlebone, crushed eggshell, oyster shell). Add a pinch of springtails to handle mold.
What to expect
- Weeks 1–3: the animals hide. Resist the urge to dig; count by lifting the bark.
- Weeks 4–8: gravid females (a yellowish brood pouch underneath) and the first mancae.
- Weeks 8–12: visible juveniles. Fast species like Powder Blues may double; slow Cubaris may not show young for months.
Ready to pick a species? The isopods for sale page lists every US breeder in the directory with what they currently have up.