i don't think its been mentioned yet, another aquarium in southern taiwan has has a few whale sharks in their display tank, which I'm not sure the total volume. I do strongly believe that it is a open water system, connected to the ocean which the aquarium sits adjacent to. I've posted some pictures in the Rare fish from Rare fish thread when I visited that place, and I was quite surprised to see them as I wasn't expecting it. And I believe some of the specimens from Georgia aquarium came from Taiwan also.
I wonder what would have happened if MBA kept the great whites, I believe that keeping the 2 would not have had a huge negative impact on the existing wild population, and would have provided more awareness with them being kept there in the MBA outer bay, drawing in millions more to see them, and watch them grow. Those tanks are quite larger and the other fish are more or less disposable in a loose sense?