13. Chinook Salmon (also King Salmon) - Oncorhynchus tschawytscha. Weighs up to 100 pounds. Deposits thousands of eggs when spawning. Eats smaller fish and crustacea. A very valuable food fish. Habitat is freshwater streams when young; the ocean while maturing. Returns to fresh water to spawn and die. Forestry Story - Tree farming practices help keep abundant water supplies in the Northwest. Mature trees left as seed blocks and quickly-established new tree crops protect watersheds and prevent excessive water runoff.