The Yukon River has the longest freshwater migration route of any salmon, over 3,000 km (1,900 mi) from its mouth in the Bering Sea to spawning grounds upstream of Whitehorse, Yukon. Since Chinook rely on fat reserves for energy upon entering fresh water, commercial fish caught here are highly prized for their unusually high levels of heart-healthy omega-3 fatty acids
Chinook salmon (Also known as King Salmon) may spend one to eight years in the ocean (averaging from three to four years) before returning to their home rivers to spawn.
Chinook spawn in larger and deeper waters than other salmon species and can be found in the rivers of Alaska from June till August. After laying eggs, females guard the nest from four to 25 days before dying, while males seek additional mates.
Chinook salmon eggs hatch, depending upon water temperature, 90 to 150 days after deposition. Egg deposits are timed to ensure the young salmon fry emerge during an appropriate season for survival and growth. Fry and parr (young fish) usually stay in fresh water 12 to 18 months before traveling downstream to estuaries, where they remain as smolts
The King Salmon