Porcellio Scaber Dalmation Isopods

These spotted little crustaceans are one of the most charming entry points into the isopod hobby — a creamy white base scattered with dark speckles that earned them the "Dalmatian" name. Hardy, forgiving and endlessly variable from one individual to the next, they're as rewarding for a first-time keeper as they are for a seasoned collector topping up a bioactive setup.

A Glimpse

• Origin: Europe (captive bred)
• Scientific Name: Porcellio scaber 'Dalmatian'
• Difficulty: Easy — beginner friendly
• Adult Size: 15–18 mm
• Temperature: 24–27 °C
• Humidity: 50–70% (with a moisture gradient)
• Rarity: Common
• Favourite Foods: Hardwood leaf litter, rotting wood, fresh vegetables
• Supplements: Protein (fish flake, dried shrimp) and a calcium source

Overview

The 'Dalmatian' is a selectively bred colour morph of the common rough woodlouse, Porcellio scaber. It shows a pale white to cream base broken up by random dark grey-to-black spotting, giving each animal that unmistakable spotted-dog look. No two are quite alike — some are heavily marked, others almost pure white — and the effect is genuinely eye-catching across a colony. Most juveniles start out pale and develop their spots gradually as they grow and moult, so watching a young culture mature is half the fun.

Like the rest of the genus, P. scaber can't roll into a ball when startled. Instead it relies on a slightly textured, rough exoskeleton and a habit of either freezing in place or scurrying for cover. They're active, busy animals and one of the most reliable workhorses you can add to a bioactive enclosure, steadily processing leaf litter and waste while staying out from underfoot.

One practical bonus: scaber is a poor climber on smooth surfaces, so unlike some of its faster-climbing relatives it's well suited to open-top setups as well as lidded tubs.

Basic Care

Dalmatians are about as undemanding as isopods come. They're happy at normal UK room temperatures and tolerate a broad range, so no supplemental heating is needed in most homes. The key to keeping them healthy is a clear moisture gradient rather than uniform dampness — keep one end of the enclosure lightly misted and let the other stay drier and well-ventilated, so the colony can settle wherever suits them.

Good airflow matters more than people expect. Poor ventilation is one of the most common causes of a colony struggling, so add holes around the sides of the container as well as the lid to encourage cross-flow. For more detail, our humidity and moisture guide and beginner's care guide walk through setup step by step.

Setting Up Your Colony

A starter culture does well in a tub of around 5 litres or more. Lay your substrate 5–7 cm deep using a base of organic topsoil and cover the surface with a generous layer of hardwood leaf litter. Add pieces of cork bark and rotting white wood for shelter and extra grazing — these double as both hides and a slow-release food source.

Include a calcium source such as cuttlebone or crushed eggshell to support clean moulting and steady breeding. If you ever run into trouble, our guide on why isopod colonies crash covers the most common causes and how to avoid them.

Feeding

These opportunistic feeders will take almost anything you offer. The bulk of their diet comes from the decomposing matter in the substrate itself, with fresh vegetables — courgette, carrot, squash — offered once or twice a week as a supplement. Remove anything uneaten after a day or two to keep mould down.

Protein is important for the Porcellio genus, and a colony that's well supplied with it grows faster and breeds more reliably. Offer a regular protein source such as fish flake or dried shrimp, and use oak, beech and maple leaf litter as easy, UK-available staples.

Breeding

Dalmatians breed readily and make an ideal first project for anyone wanting to grow a self-sustaining colony. Under stable conditions a healthy culture multiplies steadily, with juveniles emerging as tiny pale versions of the adults that need nothing more than the same food and moisture as the rest of the group. Because the spotting varies so much between individuals, established keepers often enjoy selectively breeding for heavier or cleaner patterns over successive generations.

Whether you're taking your first steps into the hobby or adding a hardworking, good-looking cleanup crew to an existing display, the Dalmatian is one of the most dependable isopods you can keep — and pairs well with other robust species for a varied collection.