Trap Bobber

Causes fish to escape slower when you aren't reeling them in.
Overview
The Trap Bobber is a tackle used with fishing rods. When attached, it makes the fishing progress bar decrease 33% slower whenever the fish is not inside the bar, making it easier to keep control during difficult catches and reducing the fish’s ability to escape. With an Advanced Iridium Rod using two Trap Bobbers, this effect increases to 50%.
It becomes available after reaching Fishing level 6. At that point, it can be crafted or purchased from 
Because it is a tackle rather than a bait, the Trap Bobber is equipped in the tackle slot of compatible fishing rods and is consumed only through use rather than by casting. Its main value is for fish that move unpredictably or that require longer, steadier control, since the slower bar decay gives more time to recover position between fish movements.
A few practical notes:
- The Trap Bobber is not used in any bundles.
- The Trap Bobber is not used in any quests.
- The crafting recipe is profitable, and it yields additional profit with the Blacksmith profession.
Official description
Causes fish to escape slower when you aren't reeling them in.