So the fish stayed in the river ~ 3 years before going back! Is that normal?

Just read something that I had read and forgot It says they rear for one to four years depending on the productivity of the stream. In WA most wild steelhead rear for 2 years. They wait in the eddies behind large rocks, allowing the river to bring them food in the form of insects, salmon eggs, and small fish.

I guess we should be able to figure out behind which rock they caught this fish