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.
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http://en.wikipedia.org/wiki/Beaver#In_dietary_law
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