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Since there is just one Devil Fruit for a specific ability, how does one know
about what ability it holds?  
For example, Buggy and Teach knew about the powers their Devil Fruits would
have provided them.  
It is mentioned that they had read about it.  
But if the fruit occurs only once till the user dies, how did they find out
about the fruits' powers?  


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one-piece
How is the ability of a Devil Fruit discovered?


There are a number of ways to know the abilities of a Devil's Fruit.

  * There's a Devil's Fruit book in the Grand Line, which lists several Devil's Fruits. Sanji mentions this book in Chapter 464. Spandam and Teach also make a mention of it.

![Devil's Fruit book](https://i.stack.imgur.com/1Hzuxm.png)

  * For Devil's Fruits whose ability is not known before, it can only be found out after actually eating it. In Chapter 385, when Kalifa and Kaku eat unknown Devil's Fruits, Lucci tells them that they will begin to sense the changes in due time.

![Eater will realise the ability in
time](https://i.stack.imgur.com/G2LQqm.png)

  * When a Devil's Fruit user dies, their Devil's Fruit will respawn, and hence its abilities would be known. 

In SBS Volume 48, the author Oda Eiichiro promises that a certain professor
will _eventually_ appear in the story, and explain what Devil's Fruits really
are. We can expect to know more about identification of Devil's Fruits when
that happens.


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answer


It's simple, the Punk Hazard Arc explains it all. Devil Fruits respawn,
otherwise there is no way of telling which fruit has which power without
eating it.

For eg :- If you were to eat a banana shaped Devil Fruit and die, the fruit
would regenerate into the nearest banana, like the Salamander Devil Fruit
regenerated into an apple.

Overtime, people have noted down these fruit types, and that's how they know.


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