I grew up in a town where there were just a handful of Catholics. There was and is a Catholic church but it is about the size of a one bedroom house.
Our school from grammar school through high school always served fish on Fridays, I suppose for the Catholics. No one minded and the fish was pretty good. In fact all their food was decent especially the rolls.
I teach in a public school (30 years now) We still have meatless Fridays in our cafe.
I attended a Catholic school, when meatless Fridays were the rule. Our cook served fish sticks, mac and cheese, and crackers and peanut butter. But every Friday, she also made the most scrumptious cinnamon rolls!! Every day we had fresh homemade rolls, but Fridays were the BEST!