In the last article posted by agent ,at the beggining of the paragraph, stated a chinook must be of 40 pounds,hence the problem with commertial hi- grading their limited pieces of catch for larger average pounds per fish.The smaller fish are releaced for a larger fish to make the average size better for more profit.
That's not really what it says but it is badly worded.
They don't have to be (must be) 40 pounds but rather the intent was to say they can often be 40 lbs, and then show the value per pound.
Reading the article quickly I see that the Blob, the last El Nino and a generally warmer ocean regime are all noted as contributing factors to the decline of Chinook.
Watching for over a quarter century now I agree with those observations without discounting the other things that helped get us here, such as sport-fishing and commercial fishing for them often using almost the same electronics and other technology to access them, electric down-riggers, sonar, fish-finders etc.
Over 20 years ago I listened to a talk by Dr. Kees Groot, then a recently retired DFO scientist who specialized in climate change and the effects on salmon that would/might bring, and he predicted in a very clear way that Chinook salmon would be the first to suffer greatly and we might lose them first, as the freshwater environment so vital to their early years, along with Coho and Steelhead too, is being so badly degraded by climate related changes that he feared they would be gone in a not too long a period of time.
It wasn't an encouraging talk to hear at all, looking further ahead.
Sometimes I'm glad I'm old.
Take care.