Once they enter fresh water, chum salmon stop feeding and morph into an aggressive creature intent only on mating. After spawning, they die and their bodies become a source of nutrients for everything in the forest and sea.
Filmed in Juneau, Southeast Alaska with Lynn Schooler.
With thanks to Richard Nelson, Hank Lentfer, Riley Woodford and Henk Meeuwsen for providing additional sounds.
Music: Smetana - Má Vlast and Górecki - Symphony No. 3: Il Lento E Largo