Regarding the rockfish species composition in the diet of the San Juan Island seals -

I checked the Lance and Jefferies 2007 article and the authors reported that they were not able to determine the species of rockfish being comsumed due to "acid" erosion of the otoliths. Remember scats were being used to determine the diet. They did note that there were juvenile, subadult and adult age fish in the diet. Inferred from that it is likely that at least part of that rockfish diet is something other the Puget Sound rockfish.

Tight lines
Curt