Editing online leaderboard fish is considered cheating by the developer. Use modded saves only in single-player.
Since the .sav file is just JSON, open both files in Notepad++. Copy the "UnlockedFish" array from File A and paste it over File B's array. Save. You now have a hybrid save. Just ensure you don't duplicate brackets or commas, or the JSON will break. feed and grow fish save file
The save is typically not a .sav file, but rather a .prefs or simply a file called PlayerPrefs with no extension. It is a text file that can be opened with Notepad or Notepad++. Editing online leaderboard fish is considered cheating by