Ok people, sharpen your pencils.
Lets say 500 fish return to a river.The tribes are entitled to half. So, divide 500 by 2. Subtract another modest 25 fish killed from whatever. Now, take the surviving percentage that are females that will deposit eggs & the number of eggs per hen that survive silt, sun, pollution, lack of nutrients & the flood years. Subtract the smolt that don't survive the trip to the ocean because of pollution, poor habitat & predators. Do the same process 25 times to represent the last quarter century.
Anyone from the WDFW reading this is more than welcome jump right in there with facts showing that this is anything but a downward spiral.

In fairness to the Tribes, I must point out that they have been short changed, to say the least, by the government. They've been lied too & stolen from. I don't believe the government has ever honored a treaty that has not remained in their own best interest.
Most of us would want to hold on to what precious little was left us under similar circumstance. But, that's another story. (sorry, almost went off )
However, they would probably make more money guiding tourists on rivers with healthy runs.