Didn't hear it, I know it first hand at least in the case of Marine Mammals. I work with and rehab sea lions, fur seals, elephant seals, harbor seals, and other marine mammals and we have sent many of our re-strands to zoos and aquariums but yes they are healthy when we send them out. Pretty sure this is the case for the sea otters and some of the other animals at the MB Aquarium as well.
There are definately still far to many wild caught animals in zoos though some of the research that can be performed can be very useful.
As for the whale sharks .... no I don't think they should be confined in such a small space.