Feed and Grow: Fish does not feature a traditional manual or autosave system for active gameplay sessions. If you quit the game to the desktop, your current fish's level and progress in that specific session are lost. Key Save Mechanics
Usually the same path as above, but sometimes located in:
C:\Users\[YourUserName]\Documents\My Games\Feed and Grow Fish\ feed and grow fish save file
The exact path is:
C:\Users\[YourUserName]\AppData\Local\FeedAndGrowFish\Saved\SaveGames Feed and Grow: Fish does not feature a
"fishSize", "coins", "unlockedFish", or "currentXP".