Shrimp are slaughtered in enormous numbers — over 400 billion annually — with little attention to welfare at slaughter. Emerging electrical stunning technology offers a path to reducing suffering at the point of death.
The question of shrimp sentience is scientifically contested but the precautionary principle applies: given the scale of shrimp production (billions of individuals) and emerging evidence for nociception and pain-like responses in decapods, welfare at slaughter is ethically significant. Ice slurry stunning takes 10-20 minutes to achieve insensibility — during which shrimp may experience stress. Electrical stunning systems developed for prawns and shrimp achieve instant insensibility at commercially viable speeds. The London School of Economics review (2021) concluded decapod crustaceans are likely sentient — a finding that has influenced UK legislation including them in the Animal Welfare Act.