The fact that more Late Coho retained this year (so far) only means that more returned; it says nothing about the effect of fisheries. The data has to be built from escapement outwards, including all catches. This year's run may have been larger, hence more on the grounds. Or, the closures protected the returns and put more on the grounds.

It is probably the effect of closures but until all the information is put together it is premature (in my mind) to say that. Especially since WDFW does not to regular updates and certainly not stock -specific ones for coho.