Yes, Smalma, historically the size of Chinook shrank due to fishing removals. But, in the past few years researchers are seeing smaller salmon at an age; a two year old fish now is smaller than a 2-year old fish (say) a decade ago.

I agree that the fishery removed the faster growing fish, too, but this appears different. Also, I was told that the actual quality of food is declining. The salmon have full stomachs but the nutritional quality is lower; fewer calories per gram. This made sense to me as herring have a lot more calories than some other forage fish. Anyway, the large adult salmon leave the feeding grounds for home, hit warmer water, and are unable to maintain life as they can't collect enough calories to stay alive. I was conversing with the researchers on this before retirement; they have since retired too.

Note, too, the strong correlations between the number of pinks released from AK facilities and declines in most salmon species, SRKWs, seabirds, and zooplankton.