A Delta Quadrant species whose science station Voyager was due to visit in 2373, only to find it torn apart by a subspace disturbance later identified as an astral eddy.
The Vostigye are known only by name. In the episode Real Life, Voyager arrives for a planned meeting with them at one of their space stations and finds nothing but scattered wreckage and no survivors.
Following a plasma trail away from the debris, the crew discover the cause: violent eddies that form at the boundary between space and subspace and sweep up matter from both. One such eddy had passed through the station. No Vostigye appears on screen.
The eddies also throw off large amounts of plasma, and Tom Paris takes a shuttle close to one to collect it. He is pulled inside and briefly into the layer between space and subspace before escaping. The investigation runs alongside the Doctor's experiment with a holographic family.