Both Fort Richardson and Elmendorf Air Force Base have salmon hatcheries. They are free and open to the public. You do need to show proper ID to get on the base at Fort Richardson when you go to their hatchery. They had millions of fish. Some were indoors and some were outdoors. They had salmon and trout (which, by the way, are the same family of fish). We even saw them "vacuuming" fish from an outside tank into a truck (via a very large hose). The truck would then go to a lake and stock it with the fish.
If you look closely, you can see the "rainbow" in these rainbow trout.