If you look south of the Canada-U.S. border, yes, there have been declines in species like chinook and coho. However, those declines are not nearly as precipitous as in the Fraser River and the Gulf of Georgia, so there's a lack of synchrony. In fact, some years our Okanagan River sockeye are now as high or higher than in the whole Fraser River watershed.
Yes, there are some issues, such as the earliest semi-decadal oscillations, whereby there have always been very large ups and downs over time that are independent of anything that's happening inside the Gulf of Georgia or the larger Pacific Ocean.
The big picture is climate change, but notwithstanding that, there's something very specific inside southwestern B.C. and the Fraser River that is different from south of the border and up in Alaska in some years of record runs.