Help explain this, Kalama River as an example.....

Status: WDFW has submitted natural and hatchery draft management guidelines for Kalama fall
chinook that will be used in the interim until the TRT recommendations are developed (Fall
2003). In Washington, the LCR chinook ESU includes all naturally spawned chinook populations
from the mouth of the Columbia River to the Cascade Crest. Native fall chinook have been
reported in the Kalama, but a distinct stock no longer exists. The Kalama River fall chinook
natural spawners are a mixed stock of composite production with a significant portion of the
natural spawners hatchery produced fish. Kalama fall chinook are rated healthy because
escapements have usually exceeded the escapement goal of 2,000 adults (SaSI 2002). Natural
spawning abundance has exceeded 20,000 spawners, with spawning escapements from 1986-2001
ranging from 1,420 to 24,297 (average 6.287) but escapement levels have normally ranged from 2,000 to 4,000 since 1990. Although final escapement objectives have not been established by
the NMFS through a recovery plan, WDFW has established draft interim minimum escapement
objectives. The minimum fall chinook MSY escapement goal is 400 to 450 adult spawners passed
above the weir (based on habitat between the weir and Kalama Falls Hatchery). Since some fish
swim through the weir, this would lead to an escapement of 444 to 500 spawners in most years.
In addition, there is a significant amount of spawning that occurs below the Modrow weir.

So how do you explain the bold statements above? Never mind me though I'm just a moron that has no clue about the fishing world or politics...

Why is it that a distinct stock no longer exists?

Keith