Whetfish Fin is a consumable Pouch Item in Monster Hunter World (MHW). These and other Items from fish can be gathered in the field and brought along on hunts.
A fish fin used to sharpen Weapons. Restores Sharpness greatly, but good for fewer uses than a Whetstone.
Whetfish Fins can be used from the Item Bar while in the field to restore the Sharpness of a Weapon, similarly to a Whetstone. These fins perform better than Whetstones, however - similarly to the effect of level 2 Speed Sharpening Skill. Whetfish Fins are consumed upon use.
See Loadouts for information on configuring Item storage and use.
How to Acquire Whetfish Fin