Another thing...the reason that lots of coho(not so much with chinook) are tagged but not adipose clipped,especially on the columbia,is because there are still a lot of 'double index' studies going on to evaluate whether fisherman are actually releasing 'wild' fish so a selective fishery can take place....
Here's how it works ....they tag 50k with one code and clip the ad fin ...then tag another 50k with another code but don't clip the ad fin...so now you have 100k tagged fish of hatchery origin but only 50K are clipped so you can actually tell...the other 50k look like 'wild' fish...
So...if the hatchery gets a lot of 'wild' fish back compared to hachery fish(clipped fish) then they assume some people are actually releasing the 'wild' fish....so please let unclipped fish go....or you might make it harder to justify selective fisheries in the future......