I've been trying to re-find it for ages.
We have lost knowledge of such nuance, like rewatching MASH or Trek and missing the religious and racial messages that made them so controversial then but banal today.
Like what, seals? Otters?
Something tells me that otters were never passed off as "fish".
In 1760, The Natural and Civil History of the French Dominions in North and South America did absolutely claim that there was some papal decree that otter tail was fish, and beaver was fish, and so on.
But... There's no actual Papal decree, bull, or otherwise in canon law that anyone can find. It's just a good story, not a true one.
2010. Archibishop of New Orleans. Alligator is "fish". Whether or not the pope has an opinion, such things are not fiction.
https://www.npr.org/sections/thesalt/2013/03/27/175058833/fo...