The adult stage of black soldier fly production has received less welfare attention than the larval stage. Understanding the biology and potential welfare considerations of adult BSFL contributes to comprehensive insect farming welfare assessment.
The welfare status of adult BSFL is even more uncertain than the larval stage, and the very short adult lifespan means cumulative welfare impact is proportionally smaller. However, the adult stage involves active courtship and mating behaviour that requires environmental conditions supporting these behaviours - bright light, warmth, and sufficient space. Dense adult housing that prevents mating behaviour may represent a form of welfare compromise, though whether adult BSFL have experiences of frustration or thwarted motivation is genuinely unknown. The precautionary principle suggests providing conditions that allow expression of natural adult behaviour, which also typically improves reproductive efficiency and thus serves both welfare and productivity goals.