Oral history interview with James Deacon conducted by Elizabeth Warren on August 28, 2008 for the Boyer Early Las Vegas Oral History Project. In this interview, Deacon discusses his ichthyological and environmental research around the geological formation of Devils Hole in Nevada, where he studied the Devils Hole pupfish. Deacon also describes other species of fish he studied in several different bodies of water in Nevada and his experiences over the course of those studies. He talks about how they measured population size of different fish, how species interacted with each other and responded to environmental changes, and performing ichthyological research for the University of Nevada, Las Vegas.