Eyestalk ablation — removing the eyestalk of female broodstock shrimp to stimulate reproduction — is practiced on billions of shrimp annually without anaesthesia. It is one of the most welfare-significant practices in global aquaculture.
Eyestalk ablation welfare is the most significant single welfare issue in shrimp aquaculture given its scale — billions of broodstock females undergo the procedure globally. The ablation causes tissue destruction of a sensory organ and surrounding nerve tissue without anaesthesia. Shrimp show escape behaviour during the procedure and altered behaviour afterward consistent with pain and stress. Alternative maturation methods exist and have been partially validated — dietary changes, photoperiod manipulation, and temperature management can induce maturation in some species without ablation. Industry adoption of alternatives is slow because ablation is faster and more reliable at industrial scale. Shrimp Welfare Project is funding research and offering incentives for alternative maturation validation and adoption. Consumer pressure through purchasing choices and retailer engagement can accelerate the timeline for industry change. Certification schemes that prohibit or phase out eyestalk ablation would be the most impactful regulatory intervention.