Insect Farming at Scale: Welfare in the Emerging Protein Industry
Insect farming is one of the fastest-growing sectors in global food production. Black soldier fly larvae, mealworms, crickets, and other species are being farmed at scales of billions per day to produce animal feed, pet food, and increasingly human food. As this industry grows, animal welfare considerations that once seemed abstract have become urgent — involving potentially the largest number of individual animals in any food production system in history.
The Scale of Insect Farming
Numbers That Challenge Intuition
The scale of insect farming is difficult to comprehend:
A single large black soldier fly (BSF) facility can process 100+ tonnes of waste per day using billions of larvae
Global insect production capacity was estimated at several million tonnes annually by 2025, growing rapidly
If insect protein replaces just 10% of conventional animal feed protein globally, the numbers of farmed insects would dwarf all current farmed vertebrate numbers by orders of magnitude
Animal Charity Evaluators has estimated that tens of billions of insects may already be farmed per day in current operations
If insects are sentient — even partially — the moral weight of insect farming may be among the most significant issues in animal welfare by sheer scale of potentially affected individuals.
The Sentience Question: Uncertain But Important
What We Know About Insect Sentience
The evidence for insect sentience is genuinely uncertain and scientifically contested:
Nociception confirmed: Insects have nociceptors and respond to tissue damage with protective behaviors
Motivational trade-offs: Some insects (flies, bees) show pain-suppressing behavior when injured and facing other threats — suggesting some prioritization of competing needs
Analgesic response: Morphine reduces pain-associated behaviors in some insect species
Bee pessimistic bias: Bumblebees shown to have pessimistic cognitive bias after simulated predator attack — potential indicator of negative emotional state
Neural complexity: Insect brains, while simpler than vertebrate brains, contain several hundred thousand to one million neurons in some species; function and organization differ markedly from vertebrates
Skeptical view: Many researchers argue insect neural architecture is insufficiently complex for conscious experience; pain-like behaviors may be purely nociceptive without subjective dimension
The honest scientific verdict: genuine uncertainty. The precautionary principle applied to billions of individuals suggests insect welfare deserves serious consideration.
Main Insect Species Farmed
Species
Primary Use
Welfare Evidence
Black soldier fly (Hermetia illucens)
Animal feed, pet food, fertilizer
Limited; some nociception research; highly social larvae
Mealworm (Tenebrio molitor)
Human food, animal feed, pet food
Moderate; EU approved for human food 2022; some welfare research
Yellow mealworm
Human food
Limited
Cricket (Acheta domesticus)
Human food, animal feed
Moderate; some evidence of learning and social behavior
Locusts
Human food in some markets
Limited welfare-specific research
Welfare Concerns in Insect Farming
Even with uncertainty about insect sentience, welfare scientists have identified practices of concern:
Crowding: Insect farms operate at very high densities; evidence on welfare impact is limited but crowding causes resource competition and potentially stress responses
Killing methods: Insects are typically killed by freezing, boiling, or grinding. If insects can experience pain, these methods may cause suffering. More humane alternatives (rapid freezing, CO2) may reduce suffering if insects are sentient.
Environmental conditions: Temperature, humidity, and CO2 levels affect insect health and behavior; suboptimal conditions could cause distress if insects are sentient
Substrate quality: Substrate quality affects larval health and development; poor substrates increase mortality rates
Relative Comparison: Insects vs. Vertebrates
Even under uncertainty about insect sentience, insect farming has potential welfare advantages over conventional livestock: lower feed conversion ratios mean fewer total animals for equivalent protein; insect welfare concerns (if they exist) are likely less severe than for cognitively sophisticated vertebrates; and insect farming can utilize organic waste streams. The uncertainty about insect sentience doesn't resolve the comparison — it depends heavily on how you weight uncertain but potentially real insect interests against more certain vertebrate interests.