Flashwyrm comment - seem to stop spawning

[Sukurachi]

I really like these silvery man wyrms, had always wanted one. They felt so... Blood Elfish.

Anyway, there were a ton at Azurewing Repose, and I figured I'd come back and tame one from there.
It would seem that once you finish the quests in that particular spot, the mana wyrms stop spawning.

I don't know if maybe I'm missing something, maybe I have to come back later and continue more quests (so far, at 110, nothing shows). But I just went and other than the underground untameable mechanical-looking worms, there are no longer any flying mana wyrms.

[Gimlion]

IIRC, there is a smaller cave with a billion or so of the mana wyrms in it. It wasn't tied to any quests to kill or depopulate them, afaik, so it's possible there will still be some there?

[Rhyela]

I really like these silvery man wyrms

I'm sorry, but I giggled. But yes, to answer your question, I believe there is a cave behind...Senegos?...that had some. Or very near that area.

[Wain]

There are some swimming in the water, north of Nar'thalas Academy. See the map:
http://www.wowhead.com/npc=89393/azsuna-mana-wyrm

The Spellwyrms in Suramar are just inside the entrance to the tunnels, not far from Azsuna, and easy to reach, see:
http://www.wowhead.com/npc=105884/spellwyrm

[Wain]

I really like these silvery man wyrms

I'm sorry, but I giggled.

Dr. Manhattan in Watchmen comes to mind