In this June 19, 2013 photo, U.S. Fish and Wildlife Service biologists Tristan Austring, left, and Angela James use a seine net to search for endangered Rio Grande silvery minnow in isolated pools in the riverbed near Socorro, N.M. The federal government has spent more than $150 million over the last decade trying to save the minnow, but the fish's numbers have dropped to the lowest level in 20 years and there are few signs of them reproducing in the wild. Biologists point to a combination of persistent drought and demands on the river as the cause. (AP Photo/Susan Montoya Bryan)