Whiteleg shrimp are the world's most farmed crustacean. This comprehensive guide examines welfare across the production cycle from hatchery to harvest.
Eye stalk ablation — removal of one or both eye stalks in female broodstock shrimp — is standard practice in commercial vannamei hatcheries globally. The procedure removes the sinus gland complex that suppresses gonadal maturation, inducing egg production. It is performed without anaesthesia and causes significant tissue damage. Whether the procedure causes pain in the welfare sense depends on shrimp sentience — an unresolved scientific question — but the precautionary principle argues strongly for developing and adopting alternatives.
Research into non-ablation maturation techniques is underway. Specific pathogen-free broodstock that mature without ablation are increasingly available, and research into pheromone-based maturation induction is progressing. Consumer and regulatory pressure is beginning to incentivize industry movement away from ablation.
Intensive grow-out systems maintain shrimp at extremely high densities with associated water quality management challenges. Oxygen depletion events cause acute welfare harm and mass mortality. Consistent mechanical aeration, water exchange management, and feeding protocols that minimize organic loading maintain water quality and reduce these welfare risks. Rapid chilling before harvest is a precautionary welfare measure that reduces activity and potential suffering during the harvest process.