The Fishing System in Genshin Impact offers the fun game mechanic of catching various types of fish in different parts of Teyvat. And catching fish is not just for the sake of collecting. It can actually be exchanged for items that can be beneficial in some way for you at the Genshin Impact Fishing Association.
The fish you caught can be exchanged in these Fishing Associations located in the three major regions of Teyvat. Here is the complete list of Genshin Impact Fishing Association locations and the items that can be exchanged with the fish you caught.