Brandon Senger, supervisory fisheries biologist for the Nevada Department of Wildlife, prepares his scuba diving gear for a biannual count of the Devils Hole pupfish at Devils Hole in the Ash Mead …

Brandon Senger, supervisory fisheries biologist for the Nevada Department of Wildlife, prepares his scuba diving gear for a biannual count of the Devils Hole pupfish at Devils Hole in the Ash Meadows National Wildlife Refuge on Saturday, April 7, 2018. Patrick Connolly Las Vegas Review-Journal @PConnPie