The Kolaati were a warp capable species from the Delta Quadrant. Many Kolaati engaged in criminal activities, including trafficking in narcotics such as Rhuludian crystals. Wixiban described them as being "mean as fire snakes."
In the 2370s, a destitute Wixiban worked as an agent for a Kolaati drug operation near the Nekrit Expanse, led by Tosin. In 2373, a drug deal gone awry caused him and Neelix to help trading outpost owner Bahrat arrest the Kolaati. (VOY: "Fair Trade")