Chum Salmon
Chum salmon, commonly known as dog salmon, is a large Pacific salmon species in the salmon family (Salmonidae). It is widely distributed across the North Pacific and supports important commercial, subsistence, and recreational fisheries. Chum salmon occupy offshore, coastal, and freshwater environments throughout their life cycle and are closely tied to ocean productivity and river systems.
Scientific Classification
- Family: Salmonidae
- Genus: Oncorhynchus
- Species: Oncorhynchus keta
Chum salmon are closely related to other Pacific salmon species but are distinguished by large size, distinctive spawning coloration, and pronounced canine teeth in spawning males.
Identification and Physical Characteristics
Chum salmon have a robust, elongated body built for endurance swimming. The head is moderately large, with spawning males developing prominent canine teeth and hooked jaws. The tail is moderately forked and strong, adapted for long migrations.
In ocean phases, chum salmon display a metallic blue-green back with silver sides and belly. During spawning migrations, adults undergo dramatic color changes, with dark vertical bars and contrasting coloration developing along the body.
Size, Weight, and Growth
Adult chum salmon commonly measure between 28 and 40 inches in length. Weights typically range from 10 to 30 pounds, though larger individuals are occasionally encountered. Growth occurs primarily during the marine phase, where chum salmon feed extensively before returning to freshwater.
Growth slows as fish enter spawning migrations and cease feeding.
Distribution and Range
Chum salmon are distributed throughout the North Pacific Ocean and adjacent freshwater systems. Their range extends from California north through Alaska and across the Pacific to Asia, including Japan and Russia.
Freshwater presence is strongly seasonal and driven by spawning migrations into rivers and streams.
Habitat Preferences
Chum salmon utilize a wide range of habitats throughout their life cycle. They are most commonly associated with:
- Offshore and nearshore Pacific waters
- Coastal migration corridors
- Large rivers and low-gradient streams
- Cold, well-oxygenated freshwater systems
Behavior and Movement
Chum salmon are highly migratory and anadromous. They hatch in freshwater, migrate to the ocean to grow, and return to their natal river systems to spawn. Ocean movements may span thousands of miles before fish return to freshwater.
Spawning occurs in freshwater, after which adult fish die, completing their life cycle.
Diet and Feeding Strategy
- Zooplankton
- Small crustaceans
- Squid
- Small fish
Importance to Fisheries
Chum salmon support large commercial and subsistence fisheries, particularly in Alaska and parts of Asia. They are valued for their firm flesh and are commonly processed for fresh consumption, smoking, and roe production. Management focuses on sustaining large spawning runs through harvest controls and habitat protection.
Fishing for Chum Salmon
Chum salmon are targeted using a variety of techniques depending on location and regulations. Methods include trolling in saltwater and drift or fly fishing in freshwater during spawning runs.
Success often depends on timing seasonal migrations and understanding river conditions.
The Fight
Once hooked, chum salmon are known for steady power and determined resistance rather than explosive speed. They rely on strength and persistence, often holding deep or using current to their advantage. Consistent pressure and controlled rod handling are key to landing chum salmon effectively.