editRuiga's Piranha School
Debut
Anime	Naruto Episode #188
Appears in	Anime only
Personal
Species	Piranha
Classification	Summon

Ruiga traps an enemy in an floating orb of water, then he summons a school of piranhas which attack the trapped target, slowly and painfully. Ruiga uses this on Kikujō and later Naruto Uzumaki. Kikujō died, but Naruto manages to escape death by the piranhas thanks to his comrades.