Pinnipeds in aquariums and zoos are among the most commonly displayed marine mammals — their welfare depends critically on water quality, space, and social conditions.
Pinniped welfare in captivity is more achievable than for cetaceans given their smaller home ranges and more manageable social group sizes, but still requires substantial investment. Social housing, adequate pool depth for diving, water quality management, appropriate diet and enrichment, and veterinary care are all welfare-critical. The ethical justification for holding pinnipeds is strongest for animals rescued from stranding or injury that cannot be released, weaker for captive-bred animals kept primarily for display. Behavioral training, when done with positive reinforcement for welfare monitoring rather than performance, can be a positive welfare intervention.