Bittacuda

The Bittacuda is an enemy in Super Paper Mario. It appears only in Chapter 3-2. The Bittacuda is a carnivorous orange fish, slightly bigger than Bowser. It is one of the enemies in the game that can attack even when Mario flips to 3D. The Bittacuda swim toward Mario when it spots him, but it will eventually give up chase. While it can be beaten in either 3D or 2D, it is considered easier to beat it in its 3D form.

Trivia
Its name is a portmanteau of "bit" and "barracuda".