The Porcellionides pruinosus 'Orange Koi' is a distinctive, captive-bred color morph of the common plum woodlouse, known for its vibrant orange and white or cream patterning. It's a hardy, beginner-friendly species popular for its appearance and efficiency as a bioactive clean-up crew. This morph is often considered a variant of the 'Orange Cream' or 'Orange Pied' strains.
 
Appearance and Behavior
Appearance: This isopod features a striking combination of a light orange base color with random white or cream-colored spots and patches, resembling the pattern of a koi fish. They have a smooth body with a characteristic "powdery" or velvety look. Adults typically reach a size of 1 to 1.7 cm in length.
Behavior: 'Orange Koi' are active and social, often seen foraging on the substrate surface, which makes them great display pets. They are fast-moving and prefer to use speed to escape threats rather than rolling into a defensive ball. 
 
Husbandry and Care
P. pruinosus 'Orange Koi' are easy to care for and adaptable, making them an excellent choice for novice keepers. 
Habitat: A well-ventilated enclosure with a moisture gradient is key. Provide a damp area with sphagnum moss and a drier area for them to regulate their moisture needs.
Substrate & Hides: The substrate should be a mix of organic soil, decaying leaf litter (oak, magnolia), and rotting white wood, which serves as both food and shelter. Cork bark pieces or other decor provide essential hiding spots.
Temperature & Humidity: They thrive in standard room temperatures, ideally between 18–26°C (64–79°F). While they can tolerate lower humidity, a range of 60–80% with access to a moist retreat is best.
Diet: Their diet should primarily be decaying organic matter.
Main diet: Abundant decaying hardwood leaf litter and soft, rotting wood.
Supplements: Regular protein sources (e.g., fish flakes, freeze-dried shrimp) and a consistent source of calcium (e.g., cuttlebone, eggshells, limestone rock) are vital for healthy growth and exoskeleton development.
Breeding: They are highly prolific breeders and establish large colonies quickly once the conditions are met.