Sakana Sakana no Mi, Model: Megalodon

Introduction
Altough a devil fruit, this fruit takes away two weaknesses a normal devil fruit user woudl have and those are: being unable to swim and the weakness of water. This fruit was eaten by Sven Kuechler

Strengths
The main advantages are being able to swim and breathe under water. Kuechler, the one who ate it, has mastered evey aspect of this fruit to the point of being able to only trasnfering the physical strength of a shark and nothing else. The speed and biting power is a also a force to be reckoned with in this fruit. This was on full display when Kuechler fought the King of Sharks/

Weaknesses
For an unexperienced user, the weakness would be being unable to breathe on land while in shark mode. But since Kuechler has mastered every aspct of this fruit he is able to take it away and replace it with a humans breathe on land. Other Standard weaknesses still apply.