I thought the Puyallup supreme court rulings which came after Boldt were clear that the state could regulate tribal fisheries, if necessary for conservation, and if that regulation doesn't discriminate against the tribes.

Doesn't that clarify that ESA can diminish the treaty tribes rights if required by conservation?
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The charm of fishing is that it is the pursuit of what is elusive but attainable, a perpetual series of occasions for hope. -John Buchan