The 50:50 split is WA waters. When the US/Canada Treaty was to be signed in the mid-80s the Tribes were threatening to sue to have all WA fish taken in any US fishery counted. AK indicated that they woud not sign the treaty if the Tribes sued. Following negotiations, Bill Wilkerson agreed to the current co-management outline, the suit was more or less dropped, only WA-caught fish counted, and every one lived happily ever after.

Except the fish, who mostly died in nets and on hooks.