Globally, 63 percent of the whales who died in captivity before 2014 had been in captivity for fewer than six years, according to the paper. The researchers point out that these deaths occur despite the fact that the animals are free from predators and other environmental stressors. Only eight of those whales made it past their 30th year in captivity.
The research did show that after 1985, when many orca tanks in the U.S. became large enough to allow mothers to properly nurse their calves, survival rates increased. Still, they write, survival "is remarkably poorer for captive killer whales than for wild whales."
This is no more evident than at marine parks like SeaWorld, which has devoted an entire ad recently to the claim that its captive whales live as long as those in the wild.