I have been fishing the beaches a lot this year and have seen fish like one's you claim to be Atlantic salmon. I think these fish are a mix of Sockeye and Coho. I have seen both types of fish caught out of these schools of fish that are not very aggresive. Sockeye tend not to feed on bait fish and focus more on krill which explains why they are hard to catch. The schools of Coho that have been moving through are somewhat aggressive but seem not to hit unless the bait is placed directly in front of them. They seem to be on a mission, ie heading for the rivers. I don't doubt that there are a few stray Atlantic salmon in the area but as for large schools, its not very likely.