Mutant Piranha

Mutant Piranha are the footmen of the Evil Waters Empire, and appear in both Power Rangers Oceanforce and Power Rangers Ultra Oceanforce. They are based on piranha, as said in the name.

Giant Mutant Piranha
Giant Mutant Piranha first appeared in Episode 16 of Oceanforce. They are the giant versions of Mutant Piranha.

Super Mutant Piranha
Super Mutant Piranha are the super versions of Mutant Piranha. They first appeared in Episode 2 of Ultra Oceanforce, and are a lot more harder to defeat than Mutant Piranha.