This would be, conceptually, easy to do. First, you start with an agreed-to production of a watershed in the absence of humans of any kind. Then, you'll estimate the return for a given year, based on the historic production. Based on the management goal, all the rest is harvestable and divided 50:50. Under what are called prior interceptions would be "development harvest" based on the proportion or Treaty/non-Treaty land in the watershed. Wilderness areas would be exempted. Then, the relationship by population would take its "share". At this point, reasonably "live" fish would be left for harvest.