In the Boldt Decision, WDFw and WDG were given/directed/whatever that they were responsible for conservation while the tribes managed the tribal fisheries and the state managed the state fisheries.

That was given away by Wilkerson in the 80s with both sides assuming responsibility for conservation. Equally. More or less, kinda sorta.

The state, through a series of mis-steps, did get to the point where a tribe had to agree that a closure for conservation was appropriate before it could be done.

Back pre-Wilk, the state would close a waterbody (marine catch area, river, lake, etc) for conservation and it would apply to all. Now, they just manage the non-Indians. That is why you will see one side or the other taking the high ground and say "We are closing our fisheries for conservation, you should too."