Farmed shrimp are typically killed by icing or direct ice slurry immersion without any prior stunning. Given emerging evidence of crustacean sentience, the welfare implications of current slaughter practices are increasingly scrutinised.
Shrimp slaughter welfare represents an enormous-scale welfare problem if crustaceans are sentient. The scientific debate on shrimp sentience has shifted significantly — while certainty is impossible, the weight of evidence suggests that shrimp likely experience some form of nociception and potentially suffering. Ice slurry immersion causes gradual metabolic shutdown that in fish is associated with several minutes of consciousness; whether the experience is similar in shrimp is unknown but concerning. The sheer number of farmed shrimp killed annually — orders of magnitude more than farmed vertebrates — means that even a small probability of suffering at the individual level translates to an extraordinary aggregate welfare concern. The precautionary principle strongly supports investment in humane slaughter alternatives.