"This past Thursday, August 18th, signaled a milestone in fisheries conservation in Yellowstone National Park.
Dr. Robert Gresswell of the USGS, with the support and encouragement of the fisheries team in Yellowstone, has launched a hydro-acoustic telemetry study on Yellowstone Lake. On this last Thursday the first of 140 hydro-acoustic tags were implanted in adult lake trout aboard the Sheepshead that were taken from the trap nets."
Read more at Wyoming TU