Yes, using salmon in fish and chips is very common in the Pacific NW. Three choices usually .. cod, salmon and halibut, and priced pretty much in that order. Cod cheapest, salmon and halibut a couple dollars more if priced the same, sometimes salmon being a dollar cheaper.
I can vouch for salmon as great fish and chips!
Given a choice, salmon it is. Once in awhile, order halibut for the halibut kick, and while it's delicious, most often wish I'd ordered salmon instead. The way to do it is order both.
Always curious as to what kind of salmon they're using, sockeye seems to be the most prevalent, and then pink.
Used to back away upon hearing pink as the choice, and was gently chastisized and informed a couple of times, that it's pretty good and have to agree. Whether it's grilled for a burger or battered and deep-fried, haven't been disappointed. Milder in flavour, but stays nice and moist.
'course, in a perfect world, they'd all be selling spring.