Fishing
Fishing is a game mechanic originally introduced in alpha version 0.1.7.0 and then greatly expanded for 1.0.0.0 release.
Mechanics
Basics
To fish, you have to plant your Fishing Rod in place. Once you have done that you need to wait for the rod to bob up and down as if there is something tugging on the line. When this happens, click on the rod again to reel it in. A fishing rod can catch fish from all nearby water tiles in a fairly big radius, not only the tile where the fishing line falls into water.
You can cast your rod in any body of water. All waters in the release version, including sewage, have something to be fished. In addition to live catch, you can sometimes fish up random items. In the alpha versions, only the Siphoner Pools area near Junkyard yielded any catch. Each fishing spot will deplete after a limited number of catches or tries, but most spots will restock fish after a certain timespan has passed, similar to how wildlife respawns and shops restock. Fishing spots also have varying difficulty modifiers and biting rates.
Chance to catch fish
High dexterity score helps in catching fish[1], but characters with the Fisherman feat will never fail to reel their catch in. Version 1.0.0.9 made fishing easier by increasing the chance to reel the fish in, especially for the dexterity-challenged.
The formula without fisherman feat is (0.5 + (Dexterity - 3) / 20) / fishing spot difficulty modifier, capped between 25% and 85%. With fisherman, the chance is always 100%.
Tools and feats
Fishing spots
Fish
Many medicine and poison blueprints use chemicals that can only be acquired by fishing.
| Common fish are almost ubiquitous. Low worth.
Blue eels are notable for their gel electrolyte.
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Uncommon fish are not much harder to find and catch than common ones.
Useful unique chemicals can be extracted from all of them.
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Rare fish are elusive, expensive and the hardest to catch.
All of these are commonly found in Deep Caverns.
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Black Sea fish
Black Sea of Underrail: Expedition expansion adds new fish.
Frogfish → 
Fusing Enzyme → 
Super Health Hypo
Giant Hatchetfish → 
Black Collagen → 
Coagulation Shot
Red-Lipped Batfish → 
Lophimidrine → 
Third Eye
Junk
- This section needs expansion with mechanical details, notable static items and their locations.
You can also find variety of other items: junk people have thrown into waters, remains of drowned persons or even treasures. Mostly small junk items and components, but almost anything can be fished up.
Quests
- Southern fishing tour: You need to prove your worth as a fisherman by catching all types of fish.
- Necklace signal: This necklace can be found by fishing.