Applying welfare science to the world's fastest-growing animal protein sector
Insect farming is growing rapidly as a sustainable protein source for animal feed, pet food, and increasingly human consumption. Global insect farm production is estimated at several million tonnes annually, with hundreds of billions to trillions of individual insects produced. The welfare status of farmed insects — whether they are sentient beings capable of suffering — remains genuinely uncertain but has significant ethical implications given the enormous numbers involved.
Black Soldier Fly (Hermetia illucens) — most farmed species: Larvae show limited behavioral complexity; nociception uncertain; likely lower sentience probability than social insects. Most welfare researchers assess BSF welfare concern as low-to-uncertain.
Yellow Mealworm (Tenebrio molitor): Show avoidance behavior; simple learning; nociceptors present. Some evidence for nociception but behavioral responses could be reflexive.
House Cricket (Acheta domesticus): More complex behavior; show place preference; evidence of stress responses. Higher sentience probability than larvae-based species.
Honey Bees: Strong evidence of sentience (see separate bee welfare page); insect farms using bees require higher welfare standards.
Given uncertainty, precautionary welfare principles suggest minimizing potential suffering where this can be achieved at low cost. Key welfare-relevant practices: avoid extreme temperature shock killing (freezing preferred over boiling); provide appropriate substrates and density; avoid dehydration stress; use rapid thermal killing methods. The Insect Welfare Research Society and Invertebrate Welfare are developing evidence-based guidelines.