Smooth isopods

Porcellio laevis is the smooth woodlouse. Its relatively smooth back distinguishes it from some other woodlice, but a trade name such as dairy cow does not confirm identity on its own. Ask which scientific name the supplier uses and keep the colony labelled. British conservation and distribution labels describe British records, not the status of every captive line worldwide.

Individual lifespans are commonly estimated at two to three years, but a breeding colony can continue for much longer. Decide where surplus animals will go and who will check the culture while you are away. These animals are better observed under a shelter than handled repeatedly.

Use a secure, ventilated container with soil, decomposing hardwood leaves and several low shelters. Keep a damp refuge at one side and less damp litter elsewhere so animals can choose. A published 20 × 20 cm culture example with 5 cm of substrate is a starting method, not space for an unlimited population. Expand before crowding removes those choices.

Measure the temperature near the shelters before adding heat. Research using an average of 24°C studied responses to temperature changes; it did not establish an ideal pet setting. Ask about the conditions used for your actual culture. Keep the container away from direct sunlight and uncontrolled heaters.

Ordinary room daylight can provide a day-night cycle. Keep shaded shelters available and avoid strong lamps that heat or dry the box. The reviewed evidence does not establish a species-specific UVB or UVI requirement, so a reptile basking setup is not a suitable default.

Check the substrate under the damp shelter directly. It should hold moisture without flooding the container, while the opposite side remains less damp. Condensation on a lid does not tell you whether that refuge is usable. Keep ventilation clear and correct a drying refuge before simply adding more food.

Decaying leaf litter is the continuing food supply. Provide a calcium source and small supplementary portions, checking what is eaten before adding more. Remove spoiled extras and replenish exhausted litter. Rich food piled into a damp box can foul the habitat faster than the animals can use it.

Expect animals to hide beneath bark and leaves. Lift one inspection shelter rather than turning over the whole culture at every check. Move animals on a piece of bark or in a small container; do not squeeze them between your fingers. Pale, newly moulted animals need their protected resting places.

Females carry developing young in a brood pouch. Preserve sheltered substrate for the smallest animals and allow room for population growth. Repeated deaths, failed moults or a persistent decline need a review of moisture, food, contamination and recent additions with an experienced isopod keeper. Do not use insecticides or improvised medicines in the culture.

Keep supplier and lineage records, and plan secure disposal or rehoming of surplus stock. Do not release captive animals or substrate outdoors. Isopods are crustaceans, so the general UK pet-invertebrate import guidance does not cover them; ask APHA about the exact species and route before importing.

Before arrival, set up damp and drier areas, decaying leaves and room for growth. During routine checks, inspect moisture, food use and unusual losses. Record transfers and new additions. Before adding the colony to another animal’s enclosure, check compatibility, especially around eggs and vulnerable moulting animals.