That's "weak stock management". Essentially, some stock is having some issues. Even if a miracle occurred and every PS Chinook stock was achieving optimum escapement one or more of those stocks would control fishing. Each stock has its own productivity. in some, R/S might be 1.2, in another 1.5, and third 2.0. The mixed stock fisheries should still be controlled by the needs of the least productive.

In the heyday of salmon fishing there were some stocks being overfished. Now that habitat is less productive, the ocean is changing, and so on there is no way to support those levels of mixed stock harvest and preserve wild stocks.