It looks like progress is being made reducing the numbers of lake trout in Yellowstone Lake. The method is gill neting, however. This takes constant effort and money. The article mentions $400,000 a year, not much comparied to the benefits for human anglers and the many birds and mammals that feed on the Yellowstone cutthroat trout that the non-native late trout eat.
For those in not familiar with the matter. Yellowstone Lake and its upstream tributaries were home only to Yellowstone cutthroat trout until the late 1980s when lake trout got into the lake. Lake trout are usless to wildlife because they live deep and spawn deep. Worse, they eat cutthroat trout.
Lake trout are, therefore, an ecological disaster and financial loss to anlers who can only catch lake trout by using a boat and fishing deep. Those who prefer flycasting the lake and streams find success much reduced from the 1980s.
Here is a long article today in the Billings Gazette. “Gillnetting effort ‘making a dent’ in lake trout in Yellowstone Lake.” By Mike Stark.