This creature looks like a 6-inch long semi-transparent fish with a single large eye located in the center of its body along its dorsal region.
Speed swim 60 ft.
Str 1, Dex 15, Con 11, Int 1, Wis 4, Cha 2
Creatures meeting the gaze of a floating eye must succeed on a DC 10 Will save or stand and stare blankly at the floating eye (similar to the effects of a hypnotism spell) for 1d6+1 rounds. A swimming creature that fails its save does not sink, but floats on the surface of the water. The save DC is Constitution-based.