Shrimp and other decapod crustaceans have long been excluded from animal welfare legislation. Recent scientific research is challenging this exclusion, with significant implications for billions of animals consumed annually.
The scientific case for shrimp sentience has strengthened considerably in recent years. Behavioural evidence including wound-guarding after injury, avoidance learning following electric shock, and physiological stress responses suggests that decapods may experience pain. The scale of shrimp consumption makes the welfare implications enormous even if probability of sentience is moderate rather than certain. Current standard practices including boiling alive cause sustained exposure to potentially painful stimuli. The precautionary principle strongly supports treating shrimp as sentient given the low cost of improved slaughter methods relative to the potential scale of suffering being prevented. Legislative change in several countries reflects growing scientific consensus.