European eels are critically endangered yet still farmed commercially. Their complex biology, stress sensitivity, and conservation status make welfare in aquaculture a pressing ethical concern.
European eel aquaculture raises profound welfare and conservation concerns simultaneously. Because captive breeding has not been achieved commercially, the industry depends on harvesting wild glass eels — a practice that directly harms the wild population. In farms, eels experience chronic stress from intensive conditions: high stocking densities, artificial photoperiods, and water quality fluctuations. Their sensitivity to environmental conditions means welfare deteriorates rapidly under suboptimal management. At slaughter, methods such as live chilling, salt bathing, and smoking of live eels cause prolonged suffering. Electrical stunning combined with immediate brain destruction is the most humane available method but is not widely used. The fundamental conservation conflict makes eel aquaculture ethically contentious.