Sometime in the early-mid 80s WDG switched to HR-based fisheries. They did not believe they could update the runs and they further believed that fisheries occurred at fixed rates. If that was true, then regardless of run size the tribes took a fixed percentage of the run and the sporties took theirs. The rest was the escapement which was supposed to be always at or above goal.

Salmon were managed differently for a couple reasons. First were the "prior interceptions" that included sport, troll, C&S, and net dropout. These were based on the forecast, was was how the rec fisheries were initially scheduled. The commercial net fisheries were managed based on weekly in-season updates. With each update, the Priors were also updated and "new" 50:50 allocations set. Then, people fished to the number. Commercial net catch for all was reported to a centralized computer system with catch more than 95% complete within three days of the fishery.

I don't know how it is done toady other than there are few updates and catch data is not nearly as up-to-date. But we do know that the 50:50 sharing has been abandoned.