Shanties And Sea Serpents is a feature length fishing minigame done as a ttrpg.
The PDF isn't gigantic, but the information is well organized and the mechanics have some definite flesh on them.
You play by rolling to increase your distance from port, stopping periodically to try and catch fish, until you get far enough to attempt to battle your White Whale.
There's a definite Weird Nautical flavor to the illustrations, layout, and lore, and it adds a lot of charm to the game. Similarly, the PCs being called Sea Draggers is a great touch.
The game doesn't really need a GM, and it supplies the players with roll tables, a character sheet, and all the resources needed to easily play.
Shanties can also be pretty easily bolted onto another system if you want to add a whole nautical questing component to your current fantasy campaign.
Overall, if you like fishing rpgs, definitely check this one out.