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In the latest update, a mod manager has been added to the main game menu. You can now install mods by adding them to the following folder:

C:\Users\<insert username>\Documents\My Games\Megaquarium\Mods

Application Support/Megaquarium/Mods


To celebrate we have created a new fish for everyone to enjoy - the Nurse Shark. You can download it here:

If you're interested in getting into modding and discovering more mods, check out the Discord #modding channel:
Are you going to discount like on Steam? I'll jump through the hoops for GOG.
Thank you!

Discord link is expired, apparently, but the Nurse Shark is still up.