The fish is most likely the Musical Fish in Fisch Roblox, since posts and guides about the Tally Hall-related music mention “Musical Fish” and a quest tied to the Music Venue/Songstress content.

What points to it

  • A recent guide is literally about getting the Musical Fish and using it for the Songstress quest.
  • Another Fisch guide says the first step of the Music Venue quest is to catch any Musical Fish , with DJ Spinopus named as the easiest one to catch there.
  • Social posts around the same topic also tag Fisch with Tally Hall, which lines up with that music-themed fish/content.

Likely answer

  • If you mean the fish that “plays” the Tally Hall song, it’s probably DJ Spinopus or the broader Musical Fish category in Fisch.
  • If you want the exact one from a specific clip, send the clip or screenshot and I can identify it more precisely.

Extra context

The search results do not show a single official fish clearly labeled as “the Tally Hall fish,” so the safest read is that players are referring to the Musical Fish content, especially DJ Spinopus.

TL;DR: Musical Fish — especially DJ Spinopus.