Coho salmon (also known as Silver Salmon, Oncorhynchus kisuch) in the act of spawning in an Alaskan stream; Alaska, United States of America

Male Chum Salmon (also known as Dog salmon, Oncorhynchus keta) courts a female by crossing over her tail in an Alaskan stream during the summer; Alaska, United States of America

Coho Salmon (also known as Silver salmon, Oncorhynchus kisutch) parr lurking near a beaver dam in a Copper River Delta stream during the spring; Alaska, United States of America

Two hook-nose alpha male Coho Salmon (Oncorhynchus kisutch) contenders competing to spawn with adjacent female that is hovering over her under-construction redd in an Alaskan stream in autumn; 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

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

Coho Salmon (Oncorhynchus kisutch) beginning the act of spawning in an Alaska stream during autumn.

Coho Salmon (Oncorhynchus kisutch) in the act of spawning in an Alaska stream during autumn.

Coho Salmon (Oncorhynchus kisutch) in the act of spawning in an Alaska stream during autumn.

Coho Salmon (Oncorhynchus kisutch) in the act of spawning in an Alaska stream during autumn.

Coho Salmon, also known as Silver Salmon (Oncorhynchus kisutch) alpha male contenders (female in background) in an Alaskan stream during autumn; Alaska, United States of America