NAVAL AMGAZINE INDIAN ISLAND, Wash. (April 29, 2021) Jake Gregg, left, a fish biologist for United States Geological Survey Marrowstone Marine Field Station, helps identify a gunnel fish with Dan Cooper, fisheries biologist, during a beach seining at Naval Magazine Indian Island in Port Hadlock, Washington, April 29, 2021. Biologists use books to help identify different fish by focusing on specific details on the organisms. (U.S. Navy photo by Mass Communication Specialist 3rd Class Emilia C. Hilliard)