(from Cowboy State News Network) Yellowstone National Park officials say the population of native cutthroat trout in Yellowstone Lake appears to be rising amid efforts to reduce the numbers of invasive lake trout. The nets used to capture and remove lake trout also scoop up cutthroat. Workers return the cutthroat to the waters but numbers help determine the size of the population. Todd Cole, supervisor for the Yellowstone fisheries program says about 500 cutthroat were caught in the nets in 2011. That number rose to more than 1000 in 2012 and nearly 1300 this year. Officials are tracking lake trout movement through surgically-implanted radio tags to locate their spawning beds.