Proto Piranha

Polluted Piranha Plants are Piranha Plants covered in Goop created by Shadow Mario. They have appeared in Super Mario Sunshine and the GameCube version of Mario Power Tennis. They appear out of Goop Generators and come in a variety of different colors. Oddly, they do not seem to have any teeth, unlike normal Piranha Plants. They periodically release Swoopin' Stus. To defeat them, Mario must shoot water into their mouth repeatedly. During the first two encounters, Mario can defeat the plants by squirting water in their mouth three times. However, during the last two encounters, Mario must squirt water into their mouth six times to defeat them. Once defeated, they dissolve into goop, which soon disappears.

In Mario Power Tennis, Petey Piranha's Defensive Power Shot (aka Piranha Swingback) involves him creating a Polluted Piranha Plant to hit an unreachable tennis ball for him.

Trivia

 * Although the generators that the Polluted Piranha Plants come out of are made of goop, Mario cannot wash the generators away like normal goop without defeating the Polluted Piranha Plant first.
 * Different colors of the Goop depend on how these enemies attack: the pink-white Goop cannot spawn Swoopin' Stus and can only take three hits, the brown Goop can spawn Swoopin' Stus and can only take three hits, while the black Goop can spawn Swoopin' Stus and take six hits.