Somebody who is more familiar with the Kalama in particular but over the past decade or so there have been significant shifts in what stock is used. Kalama may have been using Skamania summers. These fish had a certain survival rate and a timing of return. WDFW may have shifted to a "local" broodstock. These will have a different response to culture and may have different return timing.

Another piece to consider is that under the "Mother Station" concept, where the broodstock all came from one location it is likely that those fish were exposed to significantly less fishing. Now, the local broodstock has to deal with the local fishery. What os spawned is what is not caught in active fisheries. The broodstock is selecting for fish that are less susceptible to biting. This should be a concern especially if the broodstock represents a very small fraction of the adult return.