Yes, of course there are. It is known that Pacific hake do eat salmon.
I'm familiar with an ecosystem modelling study that investigated the potential interactions between the abundance of seals, the predation on hake and so on. If seals are reduced in abundance, could that lead to an increased abundance of Pacific hake? My colleague, Carl Walters, has done that analysis and basically found that in this ecosystem model of the Strait of Georgia, absolutely not. If you reduce the abundance of harbour seals, Pacific hake would not increase enough to have any effect on the Pacific salmon species that he had included in his model, which I believe were coho salmon and chinook salmon.
Yes, of course there are some other species. Salmon sharks are perhaps increasing. They're known predators on salmon in the Pacific Ocean, but the data are quite sparse.
Of course, northern resident killer whales have increased in abundance. We do know that they're major predators of chinook salmon, but that's just one species out of many. There are some negative correlations between them and chinook salmon stock productivity, as well.