Buddy up in AK has been studying the salmon in the ocean and is seeing a real decline in size at age for Chinook and coho. Some of the coho decline seems to be because the pinks are outcompeting them in the ocean. Help in FW, hurt in salt. I don't think he was a sure why the Chinook were smaller.

Obviously lack of food; now to figure the cause(s). Then, to actually do something about it.