I don’t think that even exists here (it probably does, but it’s a minor option) but that’s probably because literally everywhere around here does fish on Friday (year round and way better than fast food but also usually fairly cheap) and a lot of places do on Wednesday as well.
And during lent, fish is always available. Chain fish places do very poorly here, other than like crab, lobster, or sushi.
I live in Wisconsin, I’m like pretty sure it probably exists, since we don’t care about our health (3 of the 4 drunkest cities in the US are within an hour drive of where I live, and it’s also the dairy capital and so we aren’t a healthy bunch overall) it’s just not a typical option since we have high standards for deep fried fish specifically.