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If someone had seen it before you'd think it would have been eaten.

And I also thought I remember a segment about no one knowing their fruit
before they ate it. (I think it was with the CP9 arc)


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one-piece
If there's only one of each fruit, how could Blackbeard recognize the "Dark Dark" fruit?


I can't recall exactly when this was said during the series, but as the
[WIKI](http://onepiece.wikia.com/wiki/Devil_Fruit) says here, when the user
dies, the fruit he ate simply regenerates inside the closest appropriate fruit
the same place where the user died and their ability is reborn into another
fruit of the same kind instead of growing from a plant.

It's only my assumption but maybe CP9 did not know what the capabilities of
their new fruit were because they were not so rare.

I think Blackbeard followed the progress of the user of Dark Fruit, so he knew
when and where it is.


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As Hashirama Senju said, Devil Fruits regenerate when its user dies (it's
shown for the first time during the Punk Hazard arc), so more than one person
can have the same Devil Fruit ability (not at the same time, of course). In
the One Piece world there are some books that give details into some Devil
Fruits, so that's how Blackbeard knew just by looking at it that the fruit
Thatch found was the Dark-Dark fruit, and also about its powers; that's why he
wanted it so much. During the Thriller Bark arc, Sanji also mentions reading
in a book about the Suke-Suke (Clear-Clear) fruit.

As for why the CP9 didn't know what the fruits Kaku and Kalifa ate were,
that's because even though some fruits are known from previous users, not all
of them are.


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It has been established by now that [Devil Fruits
respawn](https://anime.stackexchange.com/q/2979/). Therefore when a Devil
Fruit is eaten, **their shapes and powers are recorded and passed on mouth-to-
mouth** as mentioned at [this
question](https://anime.stackexchange.com/q/5919/). Seeing humanity has been
around for a while, it would make sense that the shape and powers of most
fruits are recorded by now.

To come back to your question how Blackbeard in particular knew about the
shape and the power of the Dark Fruit, it was mentioned in chapter 440, during
his fight with Ace, that **Blackbeard had memorized the shape of the Dark
Fruit. He memorized its every curve and point.** He must have read or heard
about its powers and shape, wanting the power for himself.

He did **not** follow the progress of the Dark Fruit as mentioned [in the
answer by Hashirama Senju](https://anime.stackexchange.com/a/466/). Instead,
he joined the Whitebeard crew and spent decades on his ship, because
Blackbeard thought his chances of finding the Dark Fruit would be the best. In
the end, he was correct in thinking so and despite giving up, the fruit
appeared.

![enter image description here](https://i.stack.imgur.com/HF5Ja.jpg)


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