JACKSON, Wyo. (AP) — New research predicts it will take another 14 years of killing lake trout in Yellowstone Lake in order for native cutthroat trout to be re-established to the level sought by managers.

Montana State University student John Syslo modeled the effectiveness of Yellowstone's lake trout netting and killing efforts for his doctoral dissertation.

The Jackson Hole News & Guide reports (http://bit.ly/1KvajVr) that Syslo's study also discovered that lake trout have shifted their diet away from cutthroat and now subsist primarily on a small type of scud that cutthroat also feed on.

Lake trout suppression in Yellowstone National Park began in 1998, four years after they were first discovered there. The program is now the longest running of its kind in the West. Lake trout were illegally introduced in the 1980s.