|Habitat||Lakes, rivers, the sea|
|Tools and Abilities||Jaws|
A school of Ruki fish would occasionally bite unsuspecting Matoran fingers that happen to stray into the water. They were known to be the natural enemies of Tarakava, and also had been known to drive the larger Rahi off. They often posed a problem for Ga-Matoran, as they chewed through nets, dams, etc. They were seen in the waters of both Metru Nui and Mata Nui.
The Ruki fish was one of many Rahi that could be built from the Rahi Master Builder Set.