Chinook Salmon

Fascinating facts about the Chinook Salmon

• A 44.1 kg (97 lb) king was hauled from Alaska’s Kenai River on May 17, 1985, setting the sport-caught world record, while a commercial giant of 57 kg (126 lb) was landed near Rivers Inlet in the late 1970s.
• From the Bering Sea to Whitehorse, Yukon River salmon travel over 3,000 km (1,900 mi) upstream, the longest freshwater trek of any salmon, demonstrating an unmatched endurance that links ocean and mountain ecosystems.
• When Michigan stocked its lakes in 1967 to curb alewives, which then made up 90 % of the fish community, introduced Chinook thrived on the invasive prey, yet they still depend on annual releases because they never formed self-sustaining runs in the Great Lakes.
• Adult individuals usually measure 60–90 cm (24–36 in) and weigh 4.5–22.7 kg (10–50 lb), yet some grow to 150 cm (58 in) and 59 kg (130 lb); those labeled “Tyee” must exceed 14 kg (30 lb), highlighting the species’ dramatic size potential.
• In California’s Sacramento–San Joaquin Delta, fewer than 1 % of juvenile Chinook survive, and in parts of their historic range populations have contracted by as much as 40 %, underscoring how habitat loss and dams are reshaping their future.

At a glance

About the Chinook Salmon

The Chinook salmon (Oncorhynchus tshawytscha) glides through its world in a striking palette of blue-green, red or purple on the back and head, silvery flanks and a stark white belly, its tail and upper half dotted with black spots, a unique combination among Pacific salmon. A black gum line runs along its mouth in both salt- and fresh water, and adults typically measure 60–90 cm, though giants can exceed 150 cm and weigh up to 59 kg. In the Kenai River, mature individuals average 16.8 kg, and the sport-caught world record of 44.1 kg was landed there on May 17 1985. These giants, known locally as tyee when over 14 kg, feed on amphipods, crustaceans and insects as juveniles before shifting to a diet of other fish in the ocean, where they spend three to four years (up to eight) before the instinctive return to their natal streams. Their life is a saga of transformation: after hatching, fry linger in clean, cool, oxygen-rich streams for 12–18 months, then become smolts and drift to estuaries, later venturing into the open ocean where eelgrass and seaweeds provide camouflage and rich foraging grounds. When the time comes, they navigate some of the planet’s most arduous migrations, over 3,000 km up the Yukon River or more than 2,100 m in elevation through Idaho’s Middle Fork and Upper Salmon Rivers, relying on stored fat to power the climb. A surprising trait is their euryhaline nature, allowing them to thrive in both freshwater and marine environments, and the male’s pronounced “kype” hook, a weapon for securing mates in the fiercely competitive spawning season that runs from September to December.

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