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The victorious shark is 8 years old and measures 7.2 feet long, while her victim was only 5 years old and measured 3.9 feet long.
Aquarium officials said the incident was likely a territorial dispute between the two predators.
The COEX aquarium said sharks have been seen fighting in their tanks before, but the incident marked the first time a shark was devoured by another.
Experts said the surviving shark is likely to regurgitate its swallowed rival during the next few days, as she is unlikely to be able to digest the entire fish.