Complete fish list in Fields of Mistria
Briefly

"Each fish has a different size, making it easier to hunt down. Fish sizes are categorized as small, medium, large, and giant, each with distinctive shadow sizes."
"To increase your chances of encountering a specific fish, especially rare giant ones, it's effective to refresh spawns by leaving and returning to the location where they can be found."
"The game features 111 fish types in the almanac, but only 109 actual fish, since two entries are categorized as trash. Players can also catch four Legendary fish after reaching fishing level 30."
"Observation reports suggest that players have better luck catching the Lightning and Snow Fish during storms and blizzards, even though the game only specifies 'rainy' and 'snowy' weather for these fish."
Read at Polygon
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