I've never been religious, so am unsure how this works - do people eat fish on Friday because that's what you're meant to do, or do they eat fish because they're not eating meat and vegetarian meals are not a thing that were traditionally popular?
It's difficult, and changes regularly, but I would think that e.g. locally-farmed trout was fairly safe. And of course oysters are arguably vegan, so mussels should be fairly safe also.
My university had a sizable minority of Catholics attending, and pretty much every cafeteria on campus offered some sort of fish on Fridays as an option for those wishing to observe. As a heathen, I just took advantage of that every now and then to lard up on fish 'n chips with fresh-made tartar sauce.
-- Steve was just as likely to get a cheeseburger, though.
I went to school in France, and same thing. You get fish on fridays. (Then again, I went to school in the late 1980s / early 1990s, so vegetarian menus were inconceivable.)
Given that French supermarkets don't open on Sundays, buying fish or shellfish on a Saturday is therefore a mistake: anything available that day is clearly second-best. (Or at least that's how it appeared to us on the one day that we bought fish on a Saturday.)
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http://en.wikipedia.org/wiki/Beaver#In_dietary_law
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-- Steve was just as likely to get a cheeseburger, though.
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Given that French supermarkets don't open on Sundays, buying fish or shellfish on a Saturday is therefore a mistake: anything available that day is clearly second-best. (Or at least that's how it appeared to us on the one day that we bought fish on a Saturday.)