The welfare science on captive orca killer whales is among the most thoroughly documented of any marine species, with abundant evidence that captivity causes significant psychological harm to these highly intelligent, wide-ranging cetaceans.
The welfare evidence against orca captivity is more robust than for almost any other captive species. Collapsed dorsal fins are a physical manifestation of the stress and inadequate movement of captivity. Stereotypic behaviors including circular swimming and logging are documented in most captive orcas. The disruption of multigenerational family bonds through capture and facility transfers causes behavioral changes consistent with grief and long-term psychological harm. The existence of a growing orca sanctuary movement represents acknowledgment within the industry itself that current captive conditions are inadequate for these animals.