Researchers at the University of Nevada, Reno have identified smallmouth bass, which eats the food of native species but also eats the native fish themselves.
They say they're worried the fish population could explode because smallmouth bass can survive a wide temperature range.
California Department of Fish and Game is working to remove the fish as part of the Lake Tahoe Aquatic Invasive Species Program.
The program is partially funded by the U.S. Fish and Wildlife Service and has removed more than 5,000 invasive fish so far.