Shrimp are farmed in enormous numbers and typically killed by ice-water immersion or boiling alive. Growing evidence for crustacean sentience is driving discussion of more humane slaughter practices.
Shrimp slaughter welfare is at the frontier of practical welfare ethics. The scientific evidence for crustacean sentience, while less complete than for vertebrates, has advanced sufficiently for precautionary welfare consideration to be warranted. Ice-water immersion causes a period of activity consistent with stress before unconsciousness; boiling alive almost certainly causes suffering. The challenge is scale — hundreds of billions of individual animals — and the current absence of commercially viable stunning technology. Research into electrical stunning adapted for shrimp is ongoing. In the interim, consumer awareness and demand for suppliers that are researching humane slaughter options encourages industry investment in welfare solutions.