lake trout

A new study shows that the decline in native cutthroat trout has had dramatic impacts on the migratory elk herds in the Greater Yellowstone Area. 
 

Lead Researcher Arthur Middleton and others were studying the decline of elk herds in the region, and they determined that grizzly bears were playing a greater role in those deaths than they realized. 
 

The illegal introduction of lake trout into Yellowstone Lake has harmed the cutthroat trout population.