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In the One Piece universe, Zoan Devil fruits give people animal-like abilities. Now granted, there are already amphibious mere-folk in this manga, but that's not to say there isn't (or at least, I have not yet seen) any Devil fruit that can give someone fish-like abilities.

If that's the case, would a Zoan fish Devil Fruit (say, a Fin Fin-fruit) that gave someone adapted aquatic abilities still be bound by the seawater weakness?

There are instances where this rule has been somewhat circumvented.... for instance, Brook can run on sea water without any ill effects, and his immortality means he can't drown.... however, it's uncertain if he were to sink into sea water if that same immortality would be negated and he would thus die permanently. It stands to reason, though, that if a person is a "fish person" then swimming in sea water would be a natural consequence.

Are there any instances of this occurring, or can anyone elaborate if this may not be the case, i.e., even given a new "fish-like" body, they would still be subject to the sea water-weakness rule?

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Looking at this answer on Anime & Manga, it points out this panel:

"I'm a fishman, but I can't swim... It's because of the devilish power I received along with the 'Mato-Mato' curse!!"

Vander Decken IX explains that he, a fishman, cannot swim. However, as the answer notes, he could still breathe outside of the air bubble when (spoilers for the Fish-Man Island arc)

it was removed from his ship.

Thus, they extrapolate that a human transformed by a fish Zoan fruit would still be affected by seawater, just like a fishman with a Devil Fruit. They could not swim, but would still be able to breathe.

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    Seems legit. Thank you, Storm. – Russ Rainford Aug 14 at 2:44

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