I noticed the same thing :-) I wouldn't know how widespread it is, but I'd point out this is a cultural and linguistic thing. The quoted researcher's native la

I noticed the same thing :-) I wouldn't know how widespread it is, but I'd point out this is a cultural and linguistic thing. The quoted researcher's native language is Portuguese, a language in which "carne" means "meat", but if left unqualified means "red meat", and more often than not means simply "beef". One can explicitly say "carne de boi" (cow meat) or "carne de porco" (pork meat) for clarity if necessary. In Brazil for example, a country of shared heritage and language, even pork is culturally considered to be white meat (or at least, not "red meat") in certain situations. I believe the word in this context speaks more to Portuguese cultural attitudes, from an epistemological perspective, than to English language usages. If I look up "carne de peixe" (literally "fish meat") on Google you can find results, but they seem few. To me (I'm a native speaker as well) it sounds odd, though not ungrammatical or paradoxical. Just weird. Lent is a time period during which Christian believers are supposed to abstain from luxury and worldly pleasures, including fasting of meat. The current cultural perspective is ultimately probably at least somewhat influenced by the fact that in Catholic theology, fish is not included as meat during lent, and may be consumed.