CODY, Wyo. (AP) — Wildlife managers are making headway with their programs to reduce the number of voracious lake trout in Yellowstone National Park's signature body of water, giving hope to sports enthusiasts who want the cutthroat trout to make a comeback.

Fishermen say cutthroat trout are rapidly replacing lake trout in Yellowstone Lake.

Yellowstone National Park Superintendent Dan Wenk says it is too soon to declare victory, but he says the news is encouraging.

The lake trout are considered a nuisance because they swim deep. Wildlife officials say the cutthroat trout help feed bears, osprey, eagles and other species.

The U.S. Park Service and donors are spending spent about $2 million a year to catch and kill as many lake trout each summer as possible.