The keeping of cetaceans including orcas and bottlenose dolphins in marine parks is among the most contested areas of captive animal welfare, with evidence of significant welfare compromise leading to bans in multiple jurisdictions.
The welfare case against cetacean captivity for entertainment is among the strongest in applied animal welfare. Orcas are highly intelligent social mammals that range enormous distances in tight-knit family groups — conditions that cannot be replicated in any captive facility. The behavioral evidence for welfare compromise is extensive: stereotypic behaviors, aggression between incompatibly housed individuals, skin conditions from chlorinated water, and the complete inability to engage in the complex social and predatory behaviors that define orca natural life. The shift in public and regulatory attitudes following the documentary film Blackfish reflects genuine welfare science concern, not mere sentimentality. Progressive movement toward retirement of existing animals to sea pens and prohibition of new breeding represents the welfare-appropriate trajectory for this issue.