Nibbles

From the Super Mario Wiki

Nibbles (also called Piranha) are the Chomp-like fish that inhabit the waters of Rogueport and its surrounding regions in Paper Mario: The Thousand-Year Door. If Mario falls in almost any body of water, a Nibbles will bite him, causing him to jump back to the same place he fell into the water. He will also lose one HP. These enemies cannot be battled. A few Nibbles can be seen in Sir Grodus's room in the X-Naut Fortress, where they are in an aquarium surrounding must of the room. Nibbles can even be found in swimming pools and fountains.

[edit] Foreign Names

Language	Name	Meaning
French	Pirahgnard	Pun on "piranha"

Chain Chomps
Chain Chomp Characters	Big Chomp and Little Chomp | Chompy | Chomp Country | Underchomp
Chain Chomp Species	Big Chain Chomp | Calm Chain Chomp | Chain Chawful | Chain Chomplet | Chomp Chomp | Chomp-Muncher | Chomp Shark | Dark Chomp | Incoming Chomp | Kinklink | Mecha-Chomp | Nibbles | Red Chomp | Stompin' Chomp | Stone Chomp