Technologically advanced humanoid civilization in the Delta Quadrant. The Nyrians had advanced long
range transporter systems called translocators that they used to abduct crews of passing spacecraft and nearby space stations. Using
their translocators, they replaced the crews of those ships and stations with Nyrian personnel, thereby gaining control of those vessels.
Despite these acts of piracy, the Nyrians considered themselves a benevolent people, and they went to considerable lengths to care for
those whose ships they had stolen. In 2373, Nyrian operatives abducted the crew of the Federation starship Voyager. The captivity did not
last long. Voyager captain Janeway and her crew were successful in escaping from the Nyrian vessel. In the process, they persuaded the
Nyrians to release the prisoners held in the other environments on the Nyrian ship.
VOY "Displaced" ; Star Trek Encyclopedia III