I'm just guessing but I would think it's based on the unexpected number of pinks returning specifically to the Duwamish and Puyallup systems. The 8-1 / 8-2 areas are Hood Canal, right? I'm not sure what rivers in the canal get the humpies or how they're looking for returns this year. And 9 would include the Snohomish fish, maybe that system isn't seeing the high numbers that the Duwamish and Puyallups are?
Agree it was a late call. Although I haven't been out this week, maybe there are still bright pinks coming through in the south end. I will try to find out tomorrow morning if I can make it out before work.
I’d have to think that most of the Green and Puyallup pinks come through MA 9, but I guess some could come through 8-1 and 8-2.
The canal is MA 12 as @Jake Watrous mentioned, so anything south of the bridge.
Some canal streams have natural production and the only hatchery that produces pinks that I know of which is Hoodsport has back almost 5,000 more pinks then returned in 2021.
SF