Why does no aquarium in the world have a great white shark?
Because you can't just drop any animal into captivity and expect them to thrive. Many will not survive the experience.
Great whites are open-ocean predators used to living in massive home ranges and migrating vast distances. Even the largest man-made tank would not give them nearly enough space. A few attempts have been made to keep great whites in captivity, but they almost always refuse to eat and constantly bump their tank walls, either dying or being released after a few days (AFAIK, the record is 198 days).
Yes, there are other species of shark that are regularly successfully kept in captivity, but these almost always tend to be reef species used to living nearer to the bottom and in more cramped conditions.
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