Nana, a bottlenose dolphin who had been held in captivity for over 40 years, has died at the Shimoda Aquarium in Shizuoka, Japan.
An autopsy will be carried out to determine her cause of death. Last month she became the longest surviving dolphin in captivity in Japan after 42 years and 10 months in confinement.
She was captured off the coast of Ito in 1974 and during her time in captivity gave birth to eight calves according to local reports.
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