The purpose of this thread is to add a new platform for this game labeled "Mac", and teaches people to run this game on Mac.

Basically, I am a Mac user and I found this amazing tutorial on how to play Windows Steam Games on Mac. For Windows users, I think you are able to download Insaniquarium Deluxe for Free (trial version). As for Mac Users, downloading it from websites does not work, therefore you are able to purchase the game on Steam.

Video Link:

This thread is for people who had the same problem as me for not being able to run the game on Mac. With this tutorial video, you can now be able to play all Windows Steam games on Mac.

(UPDATED)

Hello everyone, this is me ChocolateTheGaming. It has been years since I am trying to figure out how to play Windows Games on Mac and it seems that the video above that was told to use Winebottler in 2016 somehow does not quite work right now.
Therefore, I currently used an app called PlayonMac software to run the Feeding Frenzy or Insaniquarium Deluxe files from Steam Windows.

How To Do It?

First, download Steam for Windows on your Mac. You will have a file named SteamSetup.exe. In addition, download an application named PlayonMac.

Second, right click that file and open it with PlayonMac. When you open it with PlayonMac, you will see as you are opening Steam but it might look weird because of the "square writings", it is probably because it cannot read as word letter writings files. Just open it in the same way you are opening Steam Mac.

This works for me perfectly although its hard for you to find your way to navigate and sign in to your Steam Windows since it does not have letter words writings but "squares".