The Makuta Fish was a type of Rahi.
The Makuta originally created the Makuta Fish species out of viruses and liquid protodermis. When he first encountered one, Toa Metru Matau thought it resembled Teridax because of its ugliness, thus giving it its name. Nokama made her Trident out of the bones of a Makuta Fish.
These fish would jump out of the water to attack larger creatures.