Really? Then I'm wondering how the National Aquarium does it. For that matter, there's a small aquarium in the town where I live and I've adopted one of their sharks. He's been there for years. I've been part of a tour group that helped with his feeding. How do they do it? How do they keep him alive? I mean, it must be a miracle, right?
Good grief. My first post was pretty mild. I just asked everyone to consider this attraction from the sharks' point of view, at a time when McDonald's is taking steps towards treating animals more humanely (cage free hens), and the National Aquarium you mentioned decided over four years ago that their dolphin show was inhumane. In fact, they've further concluded that the dolphins' 1.2 million gallon tank is an inhumane place to keep them.
I only elaborated because another poster made the preposterous claim that sharks were immune to water contamination, which is patently absurd, right? Since you take care of the sharks, how often does your aquarium test the water quality?
I was also careful to say, MANY sharks can't be kept, not all. There are 400+ known species, only a small percent can be kept in captivity, and most require professional tanks. Feeding often runs in the $1,000's per year, so it is expensive for WDW to keep this running.
And are you claiming the sharks they keep weren't wild caught?
Only these breeds CAN be captive bred: bamboo sharks, horn sharks, and coral catsharks. (see: Marine Breed Initiative, or Coral Magazine captive breed list) But that is only to say they can be bred; 98% of saltwater fish in the aquarium trade are wild caught.
Aquarium fish are most often caught by squirting them with cyanide. They then travel from Indonesia to the US. There is a high mortality rate. (See: Nat Geographic)
TL supposedly has leopard sharks and bonnethead sharks, though I have no idea who they source their sharks.
Also, as you seem to know more about sharks that I do, please explain how the shark's the ampullae of Lorenzini and lateral line work to detect their food. It is my understanding that they are able to detect thrashing fish over long distances. I'm perhaps mistaken in thinking that tourists thrashing about in their tank is a bit annoying to them.