Razorfish

Razorfish is a consumable item obtainable from fishing.

Fishing
Razorfish can be obtained by fishing. In order to catch Razorfish, the player's hauling level has to be at least 98. Razorfish have a weight of 200.

They grant 18030 xp for the Hauling skill when caught.

Other methods
Razorfish can also be obtained by opening a Fish Case.

Usage
Razorfish is a consumable item, and can be consumed at any time by holding the use button while holding it. Razorfish offer minimal hunger and saturation but heals the player by health if consumed.

Gnawer
Razorfish can be fed to a gnawer. Feeding one to a gnawer will heal health to the player and do  damage to the gnawer.