> I guess there were no turkey buzzards or catfish in that big place over those long millenia.
Turkey buzzards don't generally peck through ice or permafrost, which is about as hard as concrete. Catfish don't stand up well to being frozen solid.
"Catfish don't stand up well to being frozen solid."
I agree fresh catfish have a better texture, but the difference is not too perceptible provided there's no freezer burn.