Slade Gorton had the opportunity to negotiate the fishing rights issue before it ended up in federal court but since his families vested interest is in fish, as in Gorton's Seafood, he chose to not negogtiate in good faith putting his own and his families personal interests ahead of the citizens of Washington State, both anglo and Indian.
So, you can thank Slade for the Boldt decision for allowing the case to go to court.
If you really have an interest in the Boldt decision in particular or treaty lawsuits in general, take the time to read about them. There are plenty of links online.

In Blackfeet country, the feds strong-armed the Sweet Grass Hills away from the Blackfeet and it took over 100 years for the feds to come up with the money agreed to at the time.