Here is a C&P from the pacific fishery Management Council
https://www.pcouncil.org/documents/2023/02/review-of-2022-ocean-salmon-fisheries.pdf/I think that he month that the fish are being killed on that coast is significant as well. The data did not transfer well. Sorry for that. If you read the last figure as the total and work back through the months it makes sense. If you use the link and go to page 29 and 30 the data is more easily read. The graph is actually showing an elimination of most harvest outside of Aug-Oct. for the WCVI commercial fishery and a reduction of about 75% from 10 years ago. What is it saying, basically is that he majority of the fish killed are in Aug-Sept. Prior to 2018-2019, he fishery was conducted throughout the year. My thought is that there are likely to be fewer US bound fish in the fishery, the later it is conducted. So it's not just the amount of fish killed but when they are killed.
It seems logical that the impacts to Columbia River and Puget Sound fish was reduced starting in 2019-2019. PS fish have other issues to deal with from large pink fry abundance to the lower nearshore marine survival that happens for many reasons in the PS. My belief is that he coastal WA fish are effected more from the late summer-early fall troll fishery that remains. The Columbia River should see impacts reduced the most from the recent reductions. This is discussed on page 10 here:
Northern British Columbia (B.C.) and Southeast Alaska (SEAK) fisheries impact far-north
migrating Chinook stocks from Washington, Oregon, and Idaho. These include Washington
coastal stocks, Columbia and Snake River bright fall and summer stocks, and far-north migrating
Oregon coastal Chinook stocks. The West Coast Vancouver Island (WCVI) troll and recreational
fisheries, in addition to recreational fisheries in the Strait of Georgia and the Strait of Juan de Fuca,
impact far-north migrating stocks (including LRW) to a lesser degree but can have a major impact
on more southerly-distributed Columbia River tule and Puget Sound stocks
There is a good discussion on pages 10-11 in the report above. Of note is that hey do say that CR and Puget sound fish have historicall
TABLE I-12. West Coast Vancouver Island aggregate abundance-based management troll Chinook salmon catch by month.
Seasona/ Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug.b/ Sept. Total
2005-2006 12,198 2,156 1,689 1,468 5,154 7,883 20,561 7,078 20,807 - 886 24,098 103,978
2006-2007 16,000 1,200 800 5,500 2,600 2,300 5,200 23,500 25,000 - - 6,000 88,100
2007-2008 3,137 - - 1,634 1,911 - 1,717 11,105 15,944 - 9,099 45,157 89,704
2008-2009 1,882 1,209 1,107 3,394 1,540 586 3,616 18,062 12,165 - 9,630 - 53,191
2009-2010 - - - - - - 8,553 31,296 23,652 - 11,642 3,980 79,123
2010-2011 - - - - 1,849 875 8,670 41,239 34,394 15,619 21,284 - 123,930
2011-2012 - - 245 129 542 243 10,493 22,334 - - 4,280 17,264 55,530
2012-2013 3,344 230 312 1,018 358 501 1,374 25,737 - - - 2,519 35,393
2013-2014 2,358 28 25 49 586 1,422 13,345 40,336 - 26,494 10,002 15,360 110,005
2014-2015 213 56 - 186 612 731 3,841 27,405 - - 13,953 7,341 54,338
2015-2016 178 13 1 51 342 315 6,456 31,799 - - 7,574 2,390 49,119
2016-2017 - - - 72 276 358 4,065 23,557 - 8,169 6,758 4,279 47,534
2017-2018 - - - 74 141 297 - 11,009 - - 5,063 2,572 19,156
2018-2019 - - - - - - - - - - 20,113 3,082 23,195
2019-2020 - - - - - - - - - - 9,524 1,781 11,305
2020-2021 - - - - - - - - - - 24,485 740 25,225
2021-2022c/ - - - - 430 242 - - - - 21,946 2,068 24,686
b/ Fishery restricted to plugs only.
a/ Includes commercial Area G troll only since the 2015-2016 season.
c/ Preliminary.
The difficulty with all of this is the large fluctuations in abundance that is normal with salmon runs. It takes years to actually see what actions are are likely to have helped. Sometimes helping means reducing the downward trend as well. So, although Chinook numbers for the Columbia river are up recently, it's hard to say it is from reduced harvest because it naturally fluctuates.
This thread started discussing PS chinook. It' even harder to pinpoint there due to the other impacts those fish deal with from predation to pollution, wild fish competition with larger pink runs etc.
The fact is though, Canada is harvesting less fish. I believe Alaska is too. and the reason is SRKW.