Why did a great white shark die after 3 days in captivity?

Keeping a great white shark in captivity is extremely difficult because it needs to constantly swim to get oxygen and maintain its body temperature. An official for PETA, Asia, criticized keeping the shark in captivity as "cruel and wrong." Efforts to give it oxygen in a separate special tank failed and it had refused to eat any food since being caught. The captured shark suddenly weakened and sank to the bottom of the tank. [Additional reporting by The Associated Press]