Right On fishNphysician!
Todd admitting that he doesn’t know the answers to those questions is indeed priceless!
No one knows exactly why the wild steelhead numbers on all of the Canadian C&R rivers that empty into the Straight of Georgia plummeted much like the north sound rivers despite the fact that they are all "protected" with mandatory wild steelhead release.
What is known is that the mandatory release of wild fish did not protect those wild stocks when challenged by adverse circumstance.
It is also known is that the mortality from CnR fisheries there was probably not a factor nor was the mortality associated with harvest on the north Puget Sound rivers likely a factor. It is known that despite decent spawning escapements on these rivers the "Production rate," number of returning adults per spawner, dropped suddenly and dramatically.
It is known why the wild steelhead populations on the Quillayute have remained stable despite the fact that thousands of wild steelhead are harvested annually. The reason is that the spawning escapements and the "production rate" have remained adequate. It is not known if the harvest there has contributed to that successful "production rate".
I agree with Todd that "it is likely that WSR on the GS and PS fish, and harvest on the Quillayute fish, are factors that are not related to either population dynamics."
Sorry Jerry G. but "protection afforded the Canadian fish by WSR and CNR" appears to be somewhat of an illusion. I can understand that releasing a fish to spawn can be beneficial in the right circumstance but how can catching them (as in CNR) be helpful in any way that harvest is not?
FishNphysician? You ask, "My eight year old gets it, why can't Plunker and Company?"
Let me point out that I have a bit more experience and knowledge than a pliable eight-year-old child does but aside from that I must ask you...
Just what is it that I don't get?