Sea lions in captivity are highly intelligent, social marine mammals whose welfare depends on complex social structures, cognitive stimulation, and appropriate aquatic environments.
Captive sea lions face welfare challenges from restricted space relative to their wild ranging behaviour, as well as the social complexity needs of a highly gregarious species. Pool sizes in many older facilities are inadequate for natural swimming behaviour. Positive reinforcement training provides cognitive enrichment and allows medical procedures to be conducted with minimal stress — a significant welfare improvement over restraint-based approaches. Social management must account for the species' natural dominance hierarchies, ensuring subordinate animals have adequate access to resources. The best welfare outcomes come from facilities that combine large, complex aquatic environments with active training programmes, varied enrichment, and well-managed social groups.