Sea lions and fur seals are commonly kept in marine parks and used in military research. Understanding their welfare needs helps evaluate different captive contexts.
Sea lion welfare in captive settings spans a range from entertainment-focused marine parks to research and military programs. The welfare question is not simply about whether sea lions can be trained — they are highly trainable and cognitive demand from training may provide some mental stimulation. The more fundamental welfare questions concern social complexity, diving depth, and territory needs that pool environments cannot replicate. The US Navy's research sea lions receive high-quality veterinary care and cognitive stimulation from mission training, representing a different welfare profile than entertainment-oriented facilities. Marine park sea lion shows involve behavioral performances that may not be welfare-compromising in themselves but occur in the context of social and environmental deprivation relative to wild conditions. The strongest welfare improvement would be larger social groups and deeper, more complex aquatic environments.