Simple Mechanic: Bait Buckets.

The concept is, as stated, simple. Sold by Hunter's Call representatives, buckets full of bait could be sold similar to how the merchants administer supply crates for one's journey at an outpost. Whether in specialized units, (A leach bucket, grub bucket, and worm bucket..) or as one with say twenty-five or-so of each, the principal adds quality of life to fishing for specific rare fish or mass amounts of one specific kind.
These can also be found in the world near ponds or shores (More common in the fishing camps across the sea of thieves,) for pirates to be bemused by, to assist fishermen in their journeys, spark a fisherman's inspiration in a pirate who was otherwise unsure of their course, or to be filled up with bait that was hardly better suited getting slime all over their bananas and to be sold to the respective trader for a handful of gold and reputation once filled, once again like the merchant's supply crates.
Note: May also have a secondary use function allowing the player to puke on demand, making it a powerful weapon alongside the Trident Of Dark Tides and Ashen Winds Skull.