Sea cucumber aquaculture is expanding rapidly in Asia. As holothurians with basic nervous systems, the welfare status of sea cucumbers is uncertain but warrants precautionary consideration.
Sea cucumber welfare exists at the frontier of animal sentience science. Their diffuse nervous system lacks the centralized processing found in vertebrates and some invertebrates — making the question of conscious experience deeply uncertain. However, they do mount defense responses to noxious stimuli including evisceration (releasing their internal organs under extreme stress), which indicates some form of negative state. Precautionary welfare consideration is appropriate given this uncertainty, particularly for aversive handling practices during sorting, transport in dry conditions, and processing. High-density culture in ponds or tanks may create crowding stress measurable through behavior. Most commercially important: wild sea cucumber harvest (still dominant in many markets) depletes species that play important ecological roles, harming the broader marine ecosystem and the many animals within it. Expanding aquaculture reduces pressure on wild populations when practiced sustainably.