Ocean bright Coho Salmon (Oncorhynchus kisutch) on their spawning migration in an underwater view in an Alaskan stream during autumn.

Female Coho Salmon (Oncorhynchus kisutch) probing behavior induces the male to false spawn, underwater view in an Alaskan stream during autumn.

Early Coho Salmon (Oncorhynchus kisutch) and late Sockeye Salmon (O. nerka) arriving at spawning grounds in an Alaskan stream during autumn.

Jack and normal male Sockeye Salmon (Oncorhynchus nerka) in an Alaskan stream during summer.

Coho Salmon (Oncorhynchus keta) at various stages of final maturation alongside late Sockeye Salmon (O. nerka) in an Alaskan stream during autumn.

Dolly Varden (Salvelinus malma) male underwater in an Alaskan stream during autumn.

Using a gape threat posture, a female Coho Salmon (also known as Silver Salmon, Oncorhynchus kisutch) challenges another for the rights to spawning territory in an Alaskan stream during the autumn; Alaska, United States of America

Alpha male Coho Salmon, also known as Silver Salmon (Oncorhynchus kisutch) maintains his position just ahead of a rival effectively blocking it's view of the female on his other side in an Alaskan stream during autumn; Alaska, United States of America

Coho Salmon (Oncorhynchus kisutch) fry near a submerged rootwad in an Alaskan stream during spring.