This, my friends, is a blobfish (Psychrolutes marcidus), a deep-sea fellow who lives of the Australian and Tasmanian coasts.
Way down in those murky depths, the pressure is MUCH higher than at sea level, so gas bladders don't work. In order to stay buoyant, Blobby here is conveniently made out of gelatinous flesh that is slightly less dense than water. He drifts around above the sea floor, eating whatever happens to float by.
Personally, I think Mr. Blobby is downright adorable. Don't you just want to poke him?! Gently, of course, because he is made of Jello.