The welfare of orcas in marine parks has been the subject of intense scientific and public debate. Evidence about their complex needs informs the ongoing discussion.
The science of orca welfare in captivity presents a compelling case that the needs of these highly intelligent, deeply social, wide-ranging marine mammals cannot be adequately met in marine park settings. Dorsal fin collapse is widely accepted as an indicator of abnormal physiological stress rather than merely an aesthetic difference. Stereotypic behaviours, aggression between incompatible individuals, and early mortality relative to wild populations all suggest chronic welfare deficits. The debate has evolved toward questions of how to improve welfare for existing captive animals through sanctuary settings and when to end orca captivity for entertainment purposes.