Not only does Alaska low hole us on the fishing side, they low hole us on the hatchery side. Alaska dumps about 1.8 billion fish a year (mostly chum and pinks) into the ocean and those fish compete directly with wild and hatchery fish from elsewhere for the same food sources in the N. Pacific. When hatchery plants from Russia, Korea and Japan are included, about 5B hatchery plants are added each year to the feeding grounds.

Since the early 1970's, the global salmon catch has been nearly perfectly correlated with the total number of hatchery plants (with a few years delay) and since about the early 1990's the global salmon harvest is approximately flat (800,000-1M metric tons). But the locations of harvest have shifted north (towards the locations of the greatest number of hatchery plants. From this, I can only conclude that there is very little we can do down south to recover our fisheries UNLESS we can reduce the rate of interception and increase our relative percentage of hatchery plants (either more from us or less from elsewhere or a combination of the two).

There is abundant evidence regarding the impact of pink salmon populations on the population of other salmon species. For just one example - see - https://krsa.com/pink-salmon-a-keystone-predator-in-the-north-pacific-salmon-food-chain/.
Also, I note that the abundance of killer whales off of Alaska has increased while the SRKW population has decreased. This is also consistent with a shift in salmon population to the north.

I couldn't figure out how to get an image of the data uploaded but the link below will get you there.
[img:center]https://photos.app.goo.gl/FdXbijCEfv6vNUhC9[/img]