A dead sockeye salmon lays in the grass; Alaska, United States of America

Underwater view of male sockeye salmon (Oncorhynchus nerka) aggression in Power Creek near Cordova, Alaska in the summer; Alaska, United States of America

Underwater view of a competing sockeye salmon (Oncorhynchus nerka) in Power Creek near Cordova, Alaska in the summer; Alaska, United States of America

Underwater view of a male sockeye salmon (Oncorhynchus nerka) in Power Creek near Cordova, Alaska in the summer; Alaska, United States of America

This female Sockeye Salmon (Oncorhynchus nerka) is creating a superimposition by excavating on an existing redd, South-central Alaska; Alaska, United States of America

Underwater view of male sockeye salmon (Oncorhynchus nerka) aggression in Power Creek near Cordova, Alaska in the summer; Alaska, United States of America

Sockeye Salmon, also known as Red Salmon (Oncorhynchus nerka) male crosses over a female as part of courtship in an Alaskan stream during the summer; Alaska, United States of America

Sockeye Salmon, also known as Red Salmon (Oncorhynchus nerka) spawning pair in an Alaskan stream during the summer; Alaska, United States of America

Sockeye Salmon, also known as Red Salmon (Oncorhynchus nerka) spawning pair in an Alaskan stream during the summer; Alaska, United States of America

Underwater view of a sockeye salmon (Oncorhynchus nerka) spawning pair and a challenger male in Power Creek near Cordova, Alaska in the summer; Alaska, United States of America

A Sockeye Salmon, also known as Red Salmon (Oncorhynchus nerka) pair in the act of spawning in an Alaskan stream during the summer; Alaska, United States of America

Sockeye Salmon, also known as Red Salmon (Oncorhynchus nerka) female in breeding (nuptial) coloration in an Alaskan stream during the summer; Alaska, United States of America

Sockeye salmon (Oncorhynchus nerka) struggles over sandspit; Paxson, Alaska, United States of America