Porcellio laevis 'Dairy Cow'
A bold, fast-moving isopod with distinctive black and white cow-pattern markings. A popular, fast-breeding species.
About this species
Porcellio laevis is a large, smooth-bodied isopod species originally from southern Europe and North Africa. The 'Dairy Cow' morph features dark grey base colour with irregular white or cream patches, resembling the markings of a Holstein cow. They are one of the fastest-breeding and fastest-moving isopod species kept in captivity, so they work well in bioactive setups.
Enclosure
A ventilated plastic tub with a minimum footprint of 30×20 cm is suitable for a starter colony. Good airflow is important. P. laevis prefers drier conditions than tropical species and will not tolerate stagnant, humid air. Provide cork bark and egg cartons for hides, along with a piece of cuttlebone for calcium.
Substrate
A good substrate mix for P. laevis is:
- 60% coco coir
- 20% organic topsoil
- 10% sand
- 10% leaf litter
Maintain a moisture gradient with one damp corner, keeping the rest of the enclosure relatively dry. A depth of 5–8 cm is sufficient. Top with dried oak or beech leaves for both shelter and food.
Feeding
P. laevis are voracious eaters and will consume a wide range of foods. A balanced diet includes:
- Dried leaves (oak, beech), the staple of their diet
- Vegetables: carrot, courgette, sweet potato
- Cuttlebone for calcium, needed for healthy moults
- Occasional protein: dried shrimp or fish flakes
Remove uneaten fresh food after 48 hours to prevent mould.
Breeding
Porcellio laevis is one of the fastest-breeding isopods in captivity. Females carry eggs in a marsupium (brood pouch) on their underside, and can produce broods every 4–6 weeks in warm conditions. Colonies can double in size within 2–3 months, making them great if you need numbers fast for bioactive setups or as feeder cultures.