Gel Puffers are gloating creatures that rely on Fuel Gel for sustenance. By processing the Fuel Gel and expelling it, they can remain in a slow-floating state.
These floating creatures will not attack Samus, however she can be damaged if she comes close to them. They will explode, releasing toxic vapors released by the Fuel Gel. They can be easily dispatched by Samus's weaponry, owing its frailness to the explosive Fuel Gel encased within it.
- "The exposure to Fuel Gel has left the shell of the Gel Puffer highly susceptible to weapon fire. Gel Puffers have come to rely on the toxic vapors given off by Fuel Gel for sustenance. They process these gasses and then expel the excess to stay afloat. The brittle shell of the Puffer, while durable in appearance, is rather thin and easily damaged." — Logbook "Gel Puffer" (Metroid Prime 3: Corruption)