With the Genshin Impact 2.1 update, travelers can now collect different types of fish throughout Teyvat. To begin your journey as a respected fisherman, you must first find the Exploding Population world quest in your journal and toggle it as active.
Speak to Katheryne at the Adventurers' Guild office in Mondstadt to learn more about the recent boom in the fish population. Then go see Nantuck the Fisherman at Lake Cider, just outside the town gates of Mondstadt.
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After this first interaction with Nantuck, he will ask you to speak to him again at another location in Cider Lake. Talking to him here automatically unlocks the fishing rod, which you can use at any fishing spot in Teyvat.
Basic fishing guide
To identify a fishing spot, look for ripples in bodies of water. You can also discern these areas by the colorful fish swimming around. Don't get too close to the fish, as staying above water or performing combat actions will scare them away. Instead, interact with the Fishing tab that appears when you get just close enough to that specific body of water.
Hold the Cast Rod button to aim, then cast your line into the water. Aim close enough that the fish can see your hook, but try not to aim your line directly at them as this will scare the fish away. When you are ready to release the line, release the button.
When a fish is interested, it may hit the hook several times before biting. Time your reaction just so you can hit the Raise Hook button as soon as possible.
If you lift your hook, the fish will struggle. Like most other fishing minigames, you'll need to balance your line tension by staying within the yellow bar and letting the meter fill up. Once the meter is full, you can reassemble your catch.
