Whopper-baiting scrimshaw

The whopper-baiting scrimshaw is an item that can be made with the Fletching skill at level 85 once all four scroll fragments of whopper-bating have been retrieved from the Player-owned port, using 10 ancient bones.

When equipped, it offers a chance at increased experience while Fishing by hooking a larger-than-normal fish (which is not caught).

This is the Fishing equivalent of the rock-crushing and log-splitting scrimshaws.