The lungfish's name is Methuselah, which comes from the Bible.
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Methuselah was Noah's grandfather, and he lived for 969 years.
This Methuselah is believed to be a "she," and is at least 90 years old.
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The Academy will be sending a tiny sample of her fin to researchers in Australia, who will try to figure out her exact age.
"She's really, basically just a big puppy dog," Aquarium curator Charles Delbeek said.
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"She's very gentle, very slow moving, but when they want to move fast they can. They can jump out of that tank and that's why we have a guard around it," he explained.
Methuselah weighs about 24 pounds.
Maybe, with her old age comes a more mature palate? She enjoys figs, but only when fresh, not frozen and thawed.
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