In poking around with some articles on the PS orcas I found that of the three resident pods of orcas found regularly here in PS (J, K, & L) only on them have shown a volatility in abundance with a recent decline and accounts for the decline in the aggregate abundance.

That is the L pod and of the 3 it seems to be the one that ranges the fartherest (members seen off Calofornia) and seems to the one that spend the least time in Puget Sound. The J pod which reportedly is the most "resident" pod (at least in the San Juans) numbers over the last 30 years has been stable or slowly increasing. From listening to the ongoing debate about "our" orcas not what I expected to find.

One diet study found at this time of the year their diet shifted so that the most commonly eaten salmon were chum. As speculated by others probably not a surprise.

Tight lines
Curt