You know that fish is a type of meat, right?
Yeah, in 21st century English fish is a meat but it's non-centrally meat so the meaning is clear when you apply Gricean norms.
Beaver meat is also a-ok! https://blogs.scientificamerican.com/thoughtful-animal/once-...
Having spent the best part of the last 17 years speaking 21st century English, this is a surprisingly strong assertion to me.
From http://www.oed.com/view/Entry/115517:
> The flesh of animals used as food, esp. excluding fish...
I think there's a slight conceptual divide on both the hard-carnivore-against-fish and pescatarian groups.
Old world traditions tend to distinguish them separately as well.
But also often monophylectically as "mammal muscle/meat".