Sea urchins are harvested in large quantities from the wild and increasingly farmed for their roe, with emerging welfare questions about their capacity for nociception.
Sea urchin welfare presents the same scientific uncertainty as other marine invertebrates: the nervous system exists, nociceptive responses occur, but the capacity for conscious suffering remains unresolved. The precautionary principle - taking welfare consideration seriously under genuine uncertainty - suggests minimising unnecessary harm in sea urchin harvesting and farming. This means using the least stressful collection and transport methods, maintaining water quality in aquaculture systems, and avoiding unnecessary handling. The conservation case for reducing overharvesting complements the precautionary welfare case. As with many marine invertebrates, the most welfare-certain approach is to reduce consumption and allow population recovery.