California sea lions are highly intelligent, social marine mammals frequently kept in aquariums and zoos. Their welfare depends on complex social management, adequate water quality, and freedom from food-based conditioning that compromises natural behaviour.
Sea lion welfare in aquariums is nuanced. The cognitive sophistication that makes sea lions excellent candidates for training also means they experience boredom, frustration, and social stress more acutely than less complex animals. Welfare concerns include social isolation of single animals, stereotypic behaviour from inadequate enrichment, and pool conditions inadequate for their thermal needs. The shift away from theatrical performances toward natural behaviour-based demonstrations improves welfare by allowing animals to engage in appropriate activities rather than unnatural tricks. Welfare-positive sea lion facilities provide varied pools with different depths, social companions, feeding enrichment that extends natural foraging behaviour, and careful monitoring of individual health and behaviour.