For Cult of the Lamb players, this is a simple guide on how to catch the 4 fish required for the fisherman’s side quest.
The Fisherman
The Fisherman NPC is found early in the game at the southeast edge of Pilgrim’s Passage. He asks you to bring him a series of fish, that being the lobster, squid, octopus, and crab. He will reward you with a holy talisman piece for each fish you bring. Once you have brought him all fish, he will open a shop to sell fish to you.
How to Fish

The Trick
While creating a new doctrine, you have 5 options to choose from. Simply level up sustenance to level 3 to unlock the Ritual of The Ocean’s Bounty. This ritual will double the amount of fish caught for 2 days, and will greatly increase the chance for special fish (such as the lobster)! From my experience, this is also a fantastic way to farm coins.