Oncorhynchus keta, commonly known as the chum salmon, inhabits the North Pacific Ocean and freshwater systems in North America and Asia. Notable for its silvery-blue body and distinctive vertical stripes during spawning, the species plays a crucial role in nutrient cycling by transporting marine-derived nutrients to freshwater ecosystems.

Oncorhynchus keta, commonly known as the chum salmon, is native to the North Pacific Ocean. Its geographical distribution includes the coastal regions of eastern Asia and North America. In Asia, it is found from the Lena River in Siberia to the Korean Peninsula. In North America, it ranges from the Arctic coast of Alaska down to the coast of California.

Chum salmon inhabit marine and freshwater environments. In marine settings, they thrive in the cold, nutrient-rich waters of the North Pacific Ocean. During their spawning phase, they migrate to freshwater rivers and streams, often traveling great distances. These freshwater habitats typically have a gravelly substrate, which is essential for egg deposition. The climate of these regions varies, but they generally experience cold winters and mild summers.

Chum salmon occupy an ecological niche as both predator and prey in their habitat. In the ocean, they feed on a variety of smaller fish, plankton, and invertebrates. As juveniles in freshwater, they consume aquatic insects and zooplankton. They play a crucial role in nutrient cycling, particularly when adults die after spawning, providing significant nutrients to freshwater ecosystems. Chum salmon are also an important food source for a variety of predators, including bears, birds, and larger fish species.