July 2010, Spawning male sockeye
Sockeye salmon get their famously bright red color and hooked nose after they return to freshwater to spawn.
Bristol Bay is home to the largest run of wild sockeye salmon in the world - with an average annual run of over 30 million fish.
This photo was taken on the Wood River, which flows into the Nushagak River just north of Dillingham, Alaska.
Photo courtesy of Thomas Quinn, University of Washington
Visit www.epa.gov/bristolbay to learn more about EPA's Bristol Bay Watershed Assessment.