Aquatron

Aquatron is one of the 200 lost Cybertronian colony worlds, located somewhere in the Orion Arm of the Milky Way. A world of endless green seas and scattered island archipelagos, its peaceful inhabitants the Aquatronians long ago adapted to their watery world, transforming into robotic fish and assorted sea life. Unlike many of the other lost colonies left isolated after the collapse of the space bridges, Aquatron was eventually found- not by Cybertronians, but by the Quintessons, who swiftly annexed the world into their Imperium and tampered with their new subject's physiologies, creating the brutal Sharkticon sub-species to maintain order on their new colony world. To outside observers, the now-subjugated Aquatronians appear to be happy and productive Energon traders under the benevolent guidance of the Quintesson's fictional Co-Prosperity Sphere, but dig a little deeper and the Quintesson's web of lies will swiftly unravel.

The AllSpark Almanac
Aquatron was part of the Quintesson Pan Galactic Co-Prosperity Sphere in the Milky Way.