Greg
Yes they do stock them in the rivers, There are to many dams for all natural . Some of the fish hit small creeks like this one did, befor the hatchery . But the majority are done at the hatchery. The main river for that fish is the Sacramento. Some other rivers are the Trinity, Klamath, American and there all have dams.
I also agree with Jimski2 thats one of the major problems out here on the west coast ocean. It is fish so hard, with nets it's cut the food supply down for the Kings . The seals are another problem . They follow the Kings and Stripers miles up the rivers and feed on them , and thats a sight to see a 25lb fish being tossed up into the air.