FEMALES become sexually mature when they reach roughly ½ their ultimate life expectancy. Mating takes place in the spring. When the female is ready, the male climbs onto the back of the female, and transfers his sperm. Both males and females can mate many times in their lives. Females can store sperm in their bodies from multiple males. Right after mating, females will not immediately mate again and will reject any potential males until they are again ready to mate.
Isopods can produce offspring up to three times in a year. After mating, eggs remain in a fluid-filled pouch in the female for 2 to 3 months. The eggs hatch inside the female and stay inside her for 3 to 4 days before they emerge. After undergoing a few molts, they’re considered independent from their mother.