Rocketfish

Rocketfish is a consumable item obtainable from fishing.

Fishing
Rocketfish can be obtained by fishing. In order to catch Rocketfish, the player's hauling level has to be at least 35. Rocketfish have a weight of 200.

They grant 840 xp for the Hauling skill when caught.

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

Usage
Rocketfish is a consumable item, and can be consumed at any time by holding the use button while holding it. Upon being consumed, Rocketfish heal the player by health.

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